The Research Developments and Trend of Municipal Bonds:
A Bibliometric Analysis
BENNY HUTAHAYAN, MOH. FADLI, SATRIA AMIPUTRA, REKA DEWANTARA
Faculty of Law,
Brawijaya University,
MT. Haryono Street, Malang City,
INDONESIA
Abstract: - This study aims to explore and analyze the development and trend of the topic of municipal bonds
in the fields of economics and business. Research data using peer-reviewed journals, as many as 478 journals
sourced from the Scopus database. Data analysis used a bibliometric approach. Bibliometric analysis utilizing
the help of R-biblioshiny and VOSviewer. The research results show an interesting trend of this research from
various indicators based on the frequencies and citations of the publications. More importantly, some popular
research areas and topics have been uncovered to analyze municipal bonds, which serve as useful inferences for
future studies in Indonesia. There are many studies on municipal bonds, but there are still few studies that map
the topic of municipal bonds with a bibliometric approach with the help of R-Biblioshiny and VOSviewer to
get meaningful and valuable results. That is the novelty of this research.
Key-Words: - Bibliometrics, Indonesia, Municipal Bonds, Research Development, Trend
Received: December 15, 2022. Revised: May 11, 2023. Accepted: May 26, 2023. Published: June 6, 2023.
1 Introduction
In recent months, people have been busy discussing
the economic situation in several countries due to
the COVID-19 pandemic. Several countries
worldwide are vulnerable to economic crises due to
the pandemic. The global pandemic has caused
economic growth to stall, making it easy to get hit
by an economic crisis. The impediment of the
economy in countries impacts the inhibition of
economic development in the regions. Fiscal
decentralization is a strategic and popular
development policy, [1]. Fiscal decentralization is a
strategic and popular development policy. Fiscal
decentralization is realized by giving authority to
lower levels of government.
Fiscal decentralization policy is carried out to
create an equitable distribution of economic
development in all regions, fulfill regional
aspirations regarding control over state financial
resources, encourage accountability and
transparency of regional governments, increase
public participation in regional development
processes, reduce inequality between regions,
ensure the implementation of minimum public
services, in each region to encourage economic
growth and improve people's welfare, [2,3]. The
Regional Government is given financial resources to
carry out government affairs which the authority of
the Regional Government. Fiscal decentralization
gives the regions the authority to manage their
regional finances.
Law Number 33 of 2004 is used as a guideline
for fiscal decentralization in Indonesia. Article 5,
paragraph 1 explains that Regional Revenue in the
implementation of decentralization consists of
Regional Income and Financing. Furthermore,
Article 5, paragraph 2 explains that the sources of
regional income are regional original income,
balancing funds, and other income.
The problem of limited sources of funds
originating from Regional Original Revenue or the
central government to meet development needs
opens up opportunities for local governments to
seek other sources of financing. One of them is local
bonds. Regional bonds are an alternative for local
governments to cover the lack of financing for
regional development. However, considering the
many cases of local bond defaults in other countries
and the risk due to high moral hazard and corruption
rates in the regions which can result in investment
failures that lead to failure to pay regional bonds,
[4].
Municipal bonds can be used to increase costs
in regional development. However, local
governments cannot issue municipal bonds directly
because there are strict requirements for issuing
municipal bonds. The difficulty in issuing municipal
bonds is due to the complicated mechanism for
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issuing municipal bonds, high costs, and the
possibility that local governments cannot/fail to pay
municipal bonds (default). Local government can
issue municipal bonds if the local government's
fiscal capacity is in good condition. Therefore, in
issuing municipal bonds for the benefit of regional
development, it must have a return on investment so
that the Regional Revenue and Expenditure Budget
(APBD) is not burdened, [5].
The government can issue municipal bonds to
finance investment activities in the public sector,
which are the affairs of local governments and can
provide income and benefits to the community
based on applicable laws and regulations. Some of
the public activities that municipal bonds can
finance are: (i) drinking water services; (ii) waste
and waste management; (iii) transportation; (iv)
hospital; (v) traditional markets; (vi) shopping areas;
(vii) entertainment centers; (viii) tourism and nature
conservation areas; (ix) terminals and sub-terminals;
(x) housing and flats; and (xi) local and regional
ports.
Thus, there is a continuous challenge for local
governments in managing to fund their public
projects, [6]. Notably, in the recent development of
fiscal decentralization, the Indonesian local
governments are still working hard in handling and
investing the municipal bonds, [7].
Considering the review from the international
context, the term regional bonds are not a common
name; instead, municipal bonds. As a result, this
review adopts the term municipal bonds as it is
generally accepted and recognized in the literature.
Several previous studies with the theme of
municipal bonds have been carried out, some of
which are Kolm et al., [8], Adelino et al., [9],
Benson & Marks, [10], and Soybel, [11]. There are
quite a several studies on municipal bonds, but there
still needs to be research that maps municipal bonds
using a bibliometric approach. Based on the
previous description, this research will conduct
municipal bond mapping with a bibliometric
approach with the help of R-Biblioshiny and
VOSviewer to obtain meaningful and valuable
results.
2 Related Works
Research on bibliometrics often has many terms,
such as scientometric, traditional literature review,
systematic review, or bibliometric analysis.
Bibliometric research on municipal bonds still needs
to be improved. This section will show some of the
previous bibliometric research on municipal bonds
topics.
Rosenbloom conducted a study entitled "A
review of the local bond market," which aims to
assess the significance of this development through
an evaluation of recent trends that affect both supply
and demand for local bonds and the resulting
securities on state and local government borrowing
costs, [12]. The discussion focuses on municipal
bonds' primary market (new edition), emphasizing
market participants, market trends over the last
fifteen years, recent market developments, and
possible future market directions. In another study,
Scorsone & Plerhoples conducted a study entitled
"A Review of Municipal Bond Issues in Michigan,"
which aims to review the condition of Michigan
municipal bonds and develop a new debt assessment
indicator system, [13].
Several previous studies that have been
described show that there still needs to be previous
research that focuses on discussing municipal
bonds. Our study attempts to be exhaustive by
reviewing all the literature and considering various
research outlets (journals). Municipal bonds are a
multidisciplinary field, thus encompassing a wide
range of publication outlets. In addition, the type of
municipal bonds literature has been published since
previous bibliometric analyzes were carried out in
the previous year carried out in the years 1907, [14],
1920, [15], and 1941, [16].
The research above is bibliometric in the old
year. To cover the gap in bibliometric research in
the field of municipal bonds, this research will
conduct a bibliometric analysis of municipal bonds
to answer several research questions (RQ) as
follows:
RQ 1
:
Which are the relevant publications
about the research of municipal
bonds?
RQ 2
:
Who are the prolific authors based on
the number of publications per year?
RQ 3
:
Which institutions have contributed
the most to the research of municipal
bonds?
RQ 4
:
Which countries of the authors
contributed the most to the research
of municipal bonds?
RQ 5
:
Which countries are cited most in
municipal bonds research
publications?
RQ 6
:
Who are the most-cited authors in the
research of municipal bonds?
RQ 7
:
What are other relevant keywords in
the research of municipal bonds?
RQ 8
:
What are the trending topics in the
research of municipal bonds?
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The bibliometric analysis in this study followed
some fundamental protocols in the review process,
[17]. Bibliometric analysis is a quantitative analysis
often used in various fields of science and is carried
out systematically so that others can carry out
similar research. In bibliometric analysis,
researchers can apply several search limitations so
that the journals obtained fit within the defined
research scope, [18]. Sources of data from the
bibliometric analysis are from national or
international databases in the form of scientific
writings (books, conference papers, journals, etc.),
[19].
The researcher used five steps of bibliometric
analysis in this study. The five steps consist of the
following:
a) Keyword determination.
b) Examination of search results.
c) Refinement of search results.
d) Compilation of search result data.
e) Data analysis.
Figure 1 shows the five steps in performing a
bibliometric analysis. Steps need to be followed so
that bibliometric research can produce good results.
Fig. 1: Five Major Steps of Bibliometric Analysis
2.1 Determining Search Keywords
The research with the theme “Municipal Bonds”
was conducted on November 22, 2022. The search
for municipal bonds was based on article titles,
abstracts, and keywords from journals. Journals
sourced from the Scopus database are used in this
study because the journals from the Scopus database
are reputable journal databases that have been
internationally recognized. Hence, they are in great
demand by great researchers to publish journals
with the Scopus index. Scopus database has high
standards and a reputation, making it a database
with quality international journals. The analysis
carried out by researchers, namely in the field of
regional bonds, uses journals of good quality so that
the analysis results are more reliable.
2.2 Preliminary Search Results
The researcher did the initial research step by
entering the keyword "Municipal Bonds" in the
Scopus database. The search results provide 608
data. The documents displayed come from
conference papers, books, journals, etc. The articles
displayed are articles from 1907 to 2022. However,
The researcher will eliminate articles from 1907 at
this stage because they are irrelevant to the research,
and the topics discussed are too outdated.
Finalising
the data
analysis
Compiling
the related
data
Refining
the search
results
Examining
the
preliminary
results
Defining
the search
keywords
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Table 1. The term “Municipal Bonds” appears for the first time in journals
2.3 Refinement of Search Results
The screening process for the initial results is
carried out at the refinement of the search results
stage. At this stage, there are two inclusion criteria
to filter the initial results, namely:
a) IC1: Journal written in English
b) IC2: Using peer-reviewed journal sources
By setting these two inclusion criteria, it is
hoped that the journals obtained for the analysis
process are the best and have scientific
contributions. So that the analysis results obtained
can be more comprehensive and reliable. After the
journal is filtered, it is stored in RIS format to be
processed in the R-Biblioshiny. A total of 478
articles were filtered after using the filter as follows:
Title-Abs-Key ( "Municipal Bonds" ) And
( Limit-To ( Language, "English" ) ) And ( Limit-
To ( Srctype, "J" ) ).
2.4 Compilation of Data Statistics
Search data from the Scopus database that has been
stored in the form of RIS, then the initial analysis is
carried out using Mendeley. Mendeley software
stores basic information about journals related to
municipal bonds topics. The basic information
includes the researcher's name, the journal's title, the
year the journal was published, the journal's
purpose, the journal's number, volume, the DOI, and
the abstract. Furthermore, the data in Mendeley was
verified and clarified. Then the use of Mendeley
will adjust to the discussion of the research question
posed. Mendeley can make it easier for researchers
to see abstracts from each journal that the researcher
will use in the results and discussion chapters.
3 Result
Data in the form of journals stored in RIS format is
then processed using R-biblioshiny and VOSviewer.
The analysis results using R-biblioshiny and
VOSviewer in the form of images. The pictures are
used to answer the research question set at the
beginning. In chapter 3, a detailed explanation of the
results of the bibliometric analysis will be described.
The analysis results will be divided into two: the
analysis results using R-biblioshiny (sub-chapters
3.1.1 to 3.1.8) and the results of the analysis using
the VOSviewer (sub-chapters 3.2.1 to 3.2.3).
3.1 Data Analysis using R-Biblioshiny
The bibliometric analysis maps data in scientific
articles following research questions researchers
have set. The researcher can determine the source of
the data. The researcher can do data mapping in
various research fields. One of the bibliometric
analysis tools is R-biblioshiny. R-biblioshiny is one
of the packages provided by R-studio. This
application displays bibliometric visualization
results with statistics and graphics.
3.1.1 Which are the Relevant Publications about
the Research of Municipal Bonds (RQ1)
Figure 2 shows the source of the article, along with
the number of published studies and their level of
relevance to the theme of municipal bonds. There
are 20 top destinations shown in figure 2. The
darker the circle color indicates the journal's
relevance level and the number of journals
published with a high research theme. The number
of documents issued ranged from 0 to 40
documents.
Public Budgeting and Finance is a journal in the
top position with the number of published papers as
many as 38 documents. Furthermore, the second
Title
Source
Description
Municipal bonds
issues explained
The Annals of the
American Academy of
Political and Social Science
Research with the title “Municipal bonds issues
explained” discusses that the main element of power in
municipal bonds lies in the right of the holder to compel
payments and in the important duty of the issuing
municipality to fulfill both principal and interest by
levying taxes on all property within its boundaries.
The protection of
municipal bonds
The Annals of the
American Academy of
Political and Social Science
A minimal investigation into how municipal bonds are
issued will reveal the conditions under which the crime of
forgery can find its origin. This study provides a brief
reference to the conditions under which protection
methods are required and a general statement of their
essential features without going into details of the almost
countless methods compiled.
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place is occupied by Financial Review, which
publishes 15 documents. In third place is the Journal
of Financial and Quantitative Analysis, with 13
journal documents. Several journal sources that
publish journals with the theme of municipal bonds
but in small numbers include Urban Lawyer and
Transport Policy.
Public Budgeting and Finance is a journal with
The publisher Wiley-Blackwell. This journal is
indexed to Scopus Q2. The scope of the journal
consists of government budgeting and finance.
Public Budgeting and Finance publishes a lot of
research on municipal bonds because municipal
bonds are included in one of the research scopes of
the journal, namely government budgeting and
finance.
The second objective of the journal that is most
relevant to municipal bonds is Financial Review.
Financial Review is also one of the journals with the
publisher Wiley-Blackwell. This journal is indexed
to Scopus Q2. The Financial Review publishes in all
areas of financial economics. Municipal bonds
match the sources of the Financial Review journal
because financial economics is one of the scopes
that fit the theme of municipal bonds.
The third objective most relevant to municipal
bonds is the Journal of Financial and Quantitative
Analysis. Cambridge University Press publishes the
Journal of Financial and Quantitative Analysis. This
journal is indexed to Scopus Q1. The journal's scope
includes corporate finance, investments, capital, and
security markets relevant to financial researchers.
Research with the theme of municipal bonds is
appropriate to be published in the Journal of
Financial and Quantitative Analysis because
municipal bonds are included in one of the research
scopes of the journal, namely finance.
Fig. 2: Most Relevant Sources
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3.1.2 Who are the Prolific Authors based on the
Number of Publications per Year (RQ2)
Figure 3 shows 20 authors who were productive in
researching municipal bonds for 102 years (1920-
2022). The author's productivity is measured by the
frequency of publishing journals in that period. The
red line in the figure indicates the writing period,
and the circle indicates the journal published in a
particular year. The larger the circle, the more
authors were published in journals that year. The
bluer the circle, the more often the author's journal
is used as a citation. Figure 3 shows that writer
Cebula, R.J. is the number one most active and
prolific writer. They are followed by Kalotay, A, in
the second position, and Liu, G, in the third
position. Cebula, R.J. is the number one most active
and prolific writer. They are followed by Kalotay,
A, in second place, and Liu, G, in third.
Cebula, R.J. is a prolific writer because he is
active in writing. This is evidenced by 1991
producing one journal, 2004 producing one journal,
2014 producing two journals, 2016 producing one
journal, 2018 producing two journals, and 2020
producing three journals. He was followed by
Kalotay, A with writing activities, namely in 2014,
producing two journals; in 2016, producing one
journal; in 2017, producing two journals; in 2018,
producing one journal; in 2019, producing one
journal; and in 2021, producing two journals.
Furthermore, Liu, G in the third position, indicated
his writing activities, namely in 2008, 2009, 2010,
2012, and 2014 each produced one journal, and in
2018 produced two journals.
Then Schurhoff, N and Green, R.C are the
authors who receive the highest number of citations
per year (188 citations). The work of Schurhoff, N,
and Green, R.C. is cited in an average of 11-12
journals per year. Both of their journals are the most
widely cited journals published in 2007. Schurhoff,
N and Green, R.C published journals entitled
"Financial intermediation and the costs of trading in
an opaque market" and "Dealer intermediation and
price behavior in the aftermarket for new bond
issues." Both journals are relevant to municipal
bonds, so they are used as citations in other research
journals.
In addition, NA is an avid writer who publishes
journals on municipal bonds from 1920 to 2022. NA
is a journal that does not contain author information
in it. NA may consist of several authors. NA
published seven journals in the period 1920 to 2022.
In 1920, 1981, and 2022 it published one journal,
while in 1978 and 2000, it published one journal.
Fig. 3: Top Author's Production Over The Time
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3.1.3 Which Institutions have Contributed the
Most to the Research of Municipal Bonds (RQ3)
Figure 4 shows the most relevant affiliations in
municipal bonds research. The longer the line and
the darker the blue, the more journals are published.
Figure 4 shows the top 20 affiliates with
publications ranging from 5 to 19 journals.
The University of Kentucky occupies the first
position as the affiliate that publishes the most
municipal bonds journals, with 19 journals. The
second position is occupied by Virginia
Commonwealth University, with seventeen journals.
The third position is occupied by Jacksonville
University, with ten journals.
Some authors from the University of Kentucky
are Painter, M., Adelino, M., Cunha, I., Ferreira,
M.A., Denison, D.V., Hackbart, M., and Moody,
M.J. Then several authors from Virginia
Commonwealth University are Daniels, K.N.,
Vijayakumar, J., Diro Ejara, and Huff, R.F. Finally,
some authors from Jacksonville University are
Cebula, R.J., Angjellari-Dajci, F., Foley, M., and
Nair-Reichert, U.
Several factors may influence authors with
University of Kentucky affiliations to publish
municipal bonds journals. The University of
Kentucky provides more than 200 majors. Of the
more than 200 majors at the University of
Kentucky, several majors can make researchers
focus on municipal bonds, namely economics,
economics minor, public policy & administration,
and pre-law. This course allows students to research
municipal bonds so that students' chances of
publishing a journal on municipal bonds are higher
than other universities.
Several relevant affiliates publish only a few
journals on municipal bonds, including the Yale
School of Management, Western Illinois University,
and Wesleyan University. Researchers from these
affiliations may focus on something other than
municipal bonds but concentrate on other areas, thus
publishing only a few journals related to municipal
bonds.
Interestingly, 19 of the top 20 most relevant
affiliates are in the United States. This shows that
researchers from the United States are interested in
researching municipal bonds.
Fig. 4: Most Relevant Affiliations
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3.1.4 Which Countries of the Authors
Contributed the Most to the Research of
Municipal Bonds (RQ4)
Figure 5 shows the Corresponding Author's Country
in graphic form. The graph shows the top 20
countries with journal frequencies in the range of 0
to 220 journals with the theme of municipal bonds.
Two colors in the chart represent Intra-country
(SCP) and intercountry (MCP) collaboration
indices. The blue graph shows journal publications
written by authors from the same country (a single
country), while the red chart shows journal
publications from different countries (multiple
countries).
The graph shows that the United States is the
most frequently affiliated country, with 203 journals
divided into 189 single-country journals and 14
journals with several countries. They are followed
by China, with ten journals divided into seven
single-state journals and three journals with several
countries. And finally, the United Kingdom has
seven journals divided into seven single-country
journals and 0 journals from several countries.
One of the papers with authors from the United
States is “Municipal bond mutual fund performance
and active share,” which was researched by Gurwitz
et al., [20]. This journal examines the performance
of US open-ended municipal bond mutual funds that
were actively managed between 1999 and 2020.
Furthermore, one of the papers with authors from
China is “The price of political polarization:
Evidence from municipal issuers during the
coronavirus pandemic,” which was researched by
Chen et al., [21]. The study estimates the financial
costs posed by political polarization among citizens
in US local governments during the COVID-19
pandemic. They measure local political polarization
by using citizen votes in the presidential election.
Fig. 5: Corresponding Author's Country
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3.1.5 Which Countries are Cited Most in
Municipal Bonds Research Publications (RQ5)
Figure 6 shows the frequency of most cited
countries in municipal bonds journals from 1920 to
2022. The longer the line and the darker the blue
indicates that a country is frequently mentioned in
the municipal bonds journal. The results show that
the United States is in the first place because it has
been cited 2,839 times. Then followed by Spain
because it has been cited 105 times, and finally,
Canada and the United Kingdom because it has been
cited 73 times. Meanwhile, the countries that have
never been quoted in the municipal bonds journal
are Poland and Slovenia.
One of the journals citing the United States is
Cebula's journal entitled "An exploratory analysis of
the impact of budget deficits and other factors on
the ex-post real interest rate yield on tax-free
municipal bonds in the United States", [22]. This
empirical study uses borrowed funds to investigate
the impact of the federal budget deficit and other
factors, particularly financial market factors, on ex-
post real interest rate yields on high-yielding
government bonds in the United States. Then, the
journal citing the country of Spain is the journal
belonging to Cestau et al. with the title "Municipal
bond markets", [23]. This study aims to understand
optimal market design and the impact of post-crisis
regulation, sustainability, and financial technology.
Moreover, the journal that cites Canada is a journal
belonging to Lai & Zhang with the title "On the
value of municipal bond insurance: An empirical
analysis," which aims to document the time
variation of the insurance value of municipal bonds
estimated from the yield of the insured bonds and
not insured on the different issue, [24].
Fig. 6: Most Cited Countries
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3.1.6 Who are the Most-Cited Authors in the
Research of Municipal Bonds (RQ6)
Figure 7 shows journals' most frequently cited
documents from 1920 to 2022 on municipal bonds.
The image provides information on the 20 most
commonly cited papers and the number of citations.
The longer and darker the blue, the more others cite
a document.
The first position is a document from Jarrow
R.A, entitled "A Markov Model for the Term
Structure of Credit Risk Spreads," which has been
quoted 671 times with an average of 26 times per
year, [25]. In the second position is a document
from Harris L.E, entitled "Secondary Trading Costs
in the Municipal Bond Market," which has been
quoted 131 times with an average of 8 times per
year, [26]. Next in the third position is a document
from Butler A.W, with the title "Corruption,
Political Connections, and Municipal Finance,"
which has been quoted 121 times with an average of
9 times per year, [27].
In addition to showing the most cited documents,
figure 7 also provides other information. In the chart
of the most cited documents, two authors' works are
widely cited, namely Butler, A.W, and Green R.C.,
each publishing two documents. Two of Butler's
A.W. works are "Corruption, Political Connections,
and Municipal Finance" and "Distance Still Matters:
Evidence from Municipal Bond Underwriting," with
121 and 96 quotes, respectively, [27, 28].
Meanwhile, Green R.C.'s two works are "Financial
Intermediation and the Costs of Trading in an
Opaque Market" and "Dealer intermediation and
price behavior in the aftermarket for new bond
issues," with 119 and 69 quotes, respectively, [29,
30].
Figure 7 also provides information that the most
cited journals are from 2004, as many as three
journals. The journal sources that contributed the
most to the documents cited were The Journal of
Finance, which consisted of six journals.
Fig. 7: Most Global Cited Documents
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3.1.7 What are Other Relevant Keywords in the
Research of Municipal Bonds (RQ7)
Figure 8 shows the top 20 keywords most relevant
to municipal bonds. The longer the line and the
darker the blue, the more relevant a word will be to
the topic of municipal bonds in 6 to 63 events. The
first word with the highest occurrences is "United
States," with 63 occurrences. In second place is
"Financial Management" with 43 occurrences.
Furthermore, the third position is "Investment," with
32 occurrences. Interestingly, of the 20 keywords
most relevant to municipal bonds, four are related to
finance, followed by investment and tax.
Some studies that use the relevant word
"Financial Management" are researched by Evans M
with the title "Getting their appetite back. In need of
capital, not-for-profit hospitals take advantage of
dropping interest rates", [31], Bernert P.M et al.
with the title "The impact of competition among
health care financing authorities on market yields
and issuer interest expenses", [32], and Blake J.W et
al. with the title "8 strategies for hospital borrowers
in 2011", [33].
Several studies that use the relevant word
"Investment" are research by Cebula R.J with the
title "The community reinvestment act and real
municipal bond interest rate yields in the united
states: evidence from the municipal bond market",
[34], Medda F.R & Cocconcelli L with the title
"Municipal bonds as a means of accelerating local
infrastructure investment", [35], and Fernandez V &
Lucey B.M with the title "Portfolio management
under sudden changes in volatility and
heterogeneous investment horizons", [36].
Fig. 8: Most Relevant Words
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3.1.8 What are the Trending Topics in the
Research of Municipal Bonds (RQ8)
Figure 9 on trending topics shows the trend of topics
that often appear on the theme of regional bonds
from year to year. Figure 9 shows that the longer the
line, the more frequently a topic appears in
municipal bonds research. The bigger the circle, the
more researchers will use this keyword in a year.
There are topics that only last a short time, like 2-3
years, and there are also topics that last longer (more
than three years). Topics in each year are collected
based on journal topics published annually. The
period of a topic persisting can be seen from the
horizontal axis shown in the figure. Figure 9 shows
26 trending topics from 1920 to 2022.
Figure 9 provides information on trending topics
in the latest year. The first position is the topic of
"debt," which appears five times from 2019 to 2022.
The second position is the "governance approach,"
which appears five times from 2021 to 2022.
Furthermore, in the third position is the topic of
"climate change: " which appeared seven times from
2014 to 2021.
Based on Figure 9, the topic that appears most
frequently in municipal bonds research is "United
States." The word "United States" appeared 63 times
between 1990 and 2017. The second most frequent
topic among municipal bonds researchers was
"financial management," which appeared 43 times
from 1984 to 2000. The third most frequent topic
was "investment." Thirty-two times in the period
from 1988 to 2014.
Other information that Figure 9 provides is a
topic that researchers have long used. The topic
"Financing" is a topic that has been used frequently
for 33 years, from 1978 to 2011, followed by the
"United States" used for 27 years from 1990 to
2017. Furthermore, finally, the topic "Investment"
was used for 26 years, from 1988 to 2014.
3.2 Data Analysis using VOSviewer
The VOSviewer analysis was used to complement
the bibliometric analysis. Data in RIS format is used
for analysis using VOSviewer. Analysis by showing
a graphical representation in the form of a map can
be done with the help of VOSviewer, [37]. VOS
viewer is widely used because of its ability to work
with large data sets, displaying sizable bibliometric
maps in a way that is easy to understand and
interpret. Based on the study of Van Eck &
Waltman, VOSviewer can handle large maps and
display co-citation maps from prominent scientific
journals, [38]. VOS viewer can also create
publication maps, country maps, author maps, or
journal maps based on a co-citation network or build
keyword maps for modeling topics. In addition, as a
free tool, VOS viewer is currently being used to
complete research related to data mining, article
clustering, and article mapping from database
sources, [39]. VOS viewer also provides cluster
analysis that shows the relationship between one
topic and another, especially in municipal bonds
research, [37, 40].
Fig. 9: Trending Topics
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3.2.1 Network Visualization
The image below is the output of the Network
Visualization. Network Visualization serves to show
the network between visualized topics. Figure 10
illustrates the network visualization of items
(keywords) related to the research topic, item, or
keyword. From Figure 10, it can be seen the
relationship between topics and absorption capacity
in terms of article titles and keywords. Network
Visualization serves to show the network between
visualized topics. In-network visualization,
keywords are represented by their labels and, by
default, a circle. The size of the label and item circle
is determined by the number of times the keyword
appears in the title and abstract. The more often the
keyword appears, the larger the item's label and the
circle will be. Based on 478 journals searched
through Scopus with the theme "Municipal Bonds"
using the VOSviewer application, the results were
that there were 4 clusters marked in blue, red,
yellow, and green.
a) Cluster 1: Cluster 1 is marked in blue. The
most dominant topic is municipal bonds.
Within cluster 1, several additional
branches/topics are rarely researched,
namely insurance, risk, management, etc.
b) Cluster 2: Cluster 2 is marked in red. The
most dominant topic is local governance.
Within cluster 2, several additional
branches/topics are rarely researched,
namely infrastructure, bonds, municipal
finance, etc.
c) Cluster 3: Cluster 3 is marked in yellow.
The most dominant topic is the united states.
Within cluster 3, several additional
branches/topics are rarely researched: tax
system, income, interest rate, etc.
d) Cluster 4: Cluster 4 is marked in green. The
most dominant topic is an investment.
Within cluster 4, several additional
branches/topics are rarely researched,
namely tax, economic aspect, human, etc.
Fig. 10: Scopus Database Network Visualization Using VOS viewer
3.2.2 Overlay Visualization
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The image below is the output of the Overlay
Visualization. Overlay Visualization serves to help
researchers to analyze the evolution of research
themes per year. Figure 11 shows the relationship
between the topic and year description (in the
bottom right corner), where the yellower color of
the connecting line, the younger the year of
research. This study uses 478 journals searched
through Scopus with the theme “municipal bonds”
from 1907 to 2022 using the VOSviewer
application. The results obtained from Overlay
Visualization are that ordinary words are rarely
used, such as green bonds, governmental
accounting, income, and debt, so that these
keywords can be used in further research. In
addition, the Figure above shows the relationship
between the topic and year description (in the lower
right corner), where the lighter the yellow color on
the connecting line, the younger the research year.
The caption in the lower right corner contains a
description that the year is less than 2000 as the
oldest color until 2022 as the youngest color.
Research on municipal bonds has been studied
from 1907 to 2022. Furthermore, in the period from
2000 down to early 2005, many studies related to
investment and financial management. In range
2010 and early 2015, there was a lot of research on
municipal bonds and finance. While in the range of
2016 and above, many studies were carried out on
the tax system, debt, financial crisis, etc.
3.2.3 Density Visualization
Figure 12 illustrates the density visualization of the
keywords in the research on municipal bonds. It
provides an opportunity for researchers to identify
the impact of potential topics as new contributions
to work in municipal bonds research. Regarding the
relevance of research topics, we can see that, for
example, the keyword "municipal bonds" rarely
have to be researched with the keyword "empirical
data" simultaneously because it is in a different
cluster. The researcher can combine these two topics
to form one new study. Overall, the financial aspects
of municipal bonds have received high density and
attention in this research field. Figure 12 shows that
the most discussed theme is municipal bonds (the
lighter the circle color). The theme of the united
states and local government then follows them.
Fig. 11: Scopus Database Visualization Overlay Using VOS viewer
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Fig. 12: Scopus Database Density Visualization Using VOS viewer
4 Discussions
Municipal Bonds are regional loans offered to the
public through public offerings in the capital
market, [41]. Issuance of municipal bonds means
providing benefits to local governments as a source
of financing solutions to encourage regional
economic growth. However, despite the benefits of
municipal bonds to local governments, Indonesia
has never issued municipal bonds. The local
government has never issued municipal bonds due
to the shallowness of the Indonesian capital market,
the lack of financial management capacity at the
local government level, and the low
creditworthiness of local governments. Therefore,
this study maps out several studies related to
municipal bonds. The bibliometric analysis has
mapped the relevant publications, profiling authors,
contributing institutions, and contributing countries,
which countries discuss municipal bonds, the most
cited authors, keywords that often appear when
discussing municipal bonds, and topics trending in
municipal bonds. The mapping of several studies
related to municipal bonds can add insight for
readers and stakeholders regarding municipal bonds.
Bibliometric analysis has been carried out on the
topic of municipal bonds. From 1907 to 2022,
research was developed on municipal bonds. This is
evidenced by the variety of journal sources that
publish municipal bonds, the variety of researchers
discussing municipal bonds, research samples, and
increasingly diverse keywords. The systematic
research on municipal bonds has been described in
the results chapter.
Many journal scopes publish financial-related
journals. However, journals that publish articles on
municipal bonds are still limited. One of the journal
sources that publish the most municipal bonds
journals is Public Budgeting and Finance. Public
Budgeting and Finance is a journal with the
publisher Wiley-Blackwell. This journal is indexed
to Scopus Q2. The scope of the journal consists of
government budgeting and finance. Public
Budgeting and Finance publishes much research on
municipal bonds because municipal bonds are
included in one of the research scopes of the journal,
namely government budgeting and finance. From
these results, if other researchers or even power
holders want to look for journals related to
municipal bonds, they can directly look for sources
in Public Budgeting and Finance. In addition, other
researchers can also publish their research on
municipal bonds in the journal Public Budgeting
and Finance. Other researchers can also publish
journals in other destinations, such as Financial
Review and the Journal of Financial and
Quantitative Analysis.
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Journal authors are also often noticed by
researchers who wish to research municipal bonds.
Researchers will check the author's background to
ensure the writing's validity. The analysis results
show that Cebula R.J is the most prolific writer in
publishing the journal municipal bonds. Cebula R.J.
is a prolific writer because he has been actively
writing from 1991 to 2020 with ten journals that
have been produced. When viewed from affiliation,
the University of Kentucky ranks first. This is
supported by the many majors related to economics,
finance, and administration. Suppose other
researchers want to write a municipal bonds journal.
In that case, they can read Cebula R.J's writings
because he is the most prolific writer, so Cebula
R.J's works follow the development of municipal
bonds from time to time. In addition, journals from
University of Kentucky researchers can also be used
as references because many of his writings discuss
municipal bonds so that researchers can trust the
results.
The country that is often discussed in municipal
bonds journals is the United States of America.
Research on municipal bonds is often conducted in
the United States because almost all states issue
bonds, [42]. This is indicated by the high
participation of the United States population to
become investors in the United States capital
market. One of the factors that encourage
Americans to believe in investing is strict
regulations. One of the investments made by the
community is the purchase of municipal bonds. In
addition, the United States has a history of being
able to repay its debts to bondholders.
Jarrow's journal is a Markov Model for the Term
Structure of Credit Risk Spreads, [25]. Municipal
bonds researchers most cite that. The journal Jarrow
discusses developing a Markov model to measure
credit risk spreads, [25]. The research model
measures the bankruptcy process by considering the
state space, time, and Markov chain. In the field of
municipal bonds, this model helps measure the risk
of issuing municipal bonds.
Municipal bonds research creates different word
trends from year to year. The word "debt" is a trend
word by researchers in the journal municipal bonds.
The word "debt" can be a trending word because
municipal bonds are debt securities issued by local
governments. Many researchers have explained the
meaning of municipal bonds in their journals.
Several studies that use the word "debt" in their
journal are Spreen & Gerrish in 2022 with the title
"Taxes and tax-exempt bonds: A literature review",
[43], Liu et al. in 2022 with the title "Account-level
analytic hierarchical mixing modeling for credit risk
of Chinese Government financing vehicle
portfolios", [44], and Phinney in 2022 with the title
"The policing of Black debt: how the municipal
bond market regulates the right to water", [45]. Each
journal uses a different topic and analysis but still
involves the word "debt" in its research. In addition
to topics that are trending among researchers lately,
some keywords are used the longest by researchers.
The keyword used the longest by researchers is
"financing." Researchers often use the topic of
financing because municipal bonds are related to
debts given by the community to the regions to
finance public sector investment activities that
provide income and benefits for the community.
These trending and frequently used topics show that
researchers are still focused on debt, governance
approaches, and climate change. Research on
municipal bonds is still tied to these topics, so there
are still many other interesting topics to examine
and analyze if they are related to municipal bonds.
The visualization of VOSviewer provides some
new insights. The graph shows several keywords
from municipal bonds that are often discussed,
including municipal bonds, local governance, the
united states, and investment. Some municipal
bonds research is limited to this topic. However,
many interesting topics can be researched and still
need to be used in journals. Keywords rarely
researched include risk, management, tax system,
income, and interest. Furthermore, the keywords
frequently studied recently are tax system, debt, and
financial crisis. The results show why there are
topics that should be discussed more. These topics
are topics that have only emerged in recent years.
Researchers can focus their writing on improving
research on rarely studied topics so that others can
get helpful information about the relationship
between topics rarely discussed and municipal
bonds.
5 Conclusion
Bibliometric analysis with the help of R-Biblioshiny
and VOSviewer for municipal bonds has been
successfully carried out. Municipal bonds research
has been conducted since 1907 until 2022 and will
continue to grow in the following years. In
summary, the results of the research that have been
described in the previous chapters are as follows:
a) The most relevant publication source for
municipal bonds research is Public
Budgeting and Finance.
b) The most prolific authors in publishing
municipal bonds journals are Cebula, R.J.
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c) The affiliate that contributes the most to
municipal bonds research is the University
of Kentucky.
d) The author country that publishes the most
municipal bonds journals is the United
States of America, both single-affiliated and
multi-affiliated.
e) The country most cited in municipal bonds
research is the United States.
f) The author and his journal most cited in
municipal bonds research are Jarrow RA, in
1997, entitled "A Markov Model for the
Term Structure of Credit Risk Spreads."
Jarrow's (1997) research has been cited 671
times.
g) The keywords relevant to municipal bonds
research are United States, Financial
Management, and Investment.
h) Debt, Governance Approach, and Climate
Change are trending topics in municipal
bonds research.
This research contributes to the development of
municipal bonds research using a bibliometric
approach, filling the gap in research on municipal
bonds that have yet to exist in recent years. This
study's data were sourced from Scopus, and
scientific writings were limited to journals and only
in English. This can be a limitation of this research
so that further research can use data from other
sources such as ScienceDirect, Wiley online library,
springer, and web of science. In addition, further
researchers can add journal boundaries that will be
used in the bibliometric analysis. From the results of
the bibliometric analysis, readers or even
stakeholders can explore municipal bonds in other
countries through various credible journals so that
local governments can issue municipal bonds to
improve regional development.
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7.
Contribution of Individual Authors to the
Creation of a Scientific Article
-Benny Hutahayan made research concepts,
analyzed them using bibliometrics, and compiled
the results.
-Moh. Fadli supervises research, validates research,
and mentors.
-Satria Amiputra validates research and research
supervision.
-Reka Dewantara conducts a review and provides
comments on the background.
Sources of Funding for Research Presented in a
Scientific Article or Scientific Article Itself
This study was self-funded.
Conflict of Interest
The authors have no conflict of interest to declare.
Creative Commons Attribution License 4.0
(Attribution 4.0 International, CC BY 4.0)
This article is published under the terms of the
Creative Commons Attribution License 4.0
https://creativecommons.org/licenses/by/4.0/deed.en
_US
WSEAS TRANSACTIONS on BUSINESS and ECONOMICS
DOI: 10.37394/23207.2023.20.108
Benny Hutahayan, Moh. Fadli,
Satria Amiputra, Reka Dewantara
E-ISSN: 2224-2899
1236
Volume 20, 2023