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Academic research has intensively analyzed the relationship between market concentration or market power and banking stability but provides ambiguous results, which are summarized under the concentration-stability/fragility view. We provide empirical evidence that the mixed results are due to the difficulty of identifying reliable variables to measure concentration and market power.

Using data from 3,943 banks operating in the European Union (EU)-15 between 2013 and 2020, we employ linear regression models on panel data. Banking market concentration is measured by the Herfindahl–Hirschman Index (HHI), and market power is estimated by the product-specific Lerner Indices for the loan and deposit market, respectively.

Our analysis reveals a significantly stability-decreasing impact of market concentration (HHI) and a significantly stability-increasing effect of market power (Lerner Indices). In addition, we provide evidence for a weak (or even absent) empirical relationship between the (non)structural measures, challenging the validity of the structure-conduct-performance (SCP) paradigm. Our baseline findings remain robust, especially when controlling for a likely reverse causality.

Our results suggest that the HHI may reflect other factors beyond market power that influence banking stability. Thus, banking supervisors and competition authorities should investigate market concentration and market power simultaneously while considering their joint impact on banking stability.

This research examines the relationship between market power and liquidity creation in the specific context of bank profitability in the Vietnamese banking sector.

The study applies the methodology proposed by Berger and Bouwman (2009) to demonstrate the creation of bank liquidity through a three-step procedure for investigating the relationship between market power and liquidity creation. The three steps include non-fat liquidity (NFLC), fat liquidity (FLC) and system generalized method of moments estimation for panel data.

This study finds that liquidity creation increases when a bank has high market power. Further, highly profitable banks positively impact the market power of banks with regard to liquidity creation, relative to less profitable banks. Moreover, bank size, capital, economic growth and interest rate negatively influence bank liquidity creation, while credit risk positively relates to bank liquidity creation.

Measurements used in this study are based on the works of Berger and Bouwman (2009). There are specific variations, relative to Basel III. In addition, other variables significantly impact bank liquidity creation that have not been considered in the models, and a quadratic model should have been considered to measure market power and bank liquidity creation.

This study suggests that managers should control the liquidity of their banks by supervising vulnerable characteristics that have been mentioned herein and emphasizing improvements in profitability. Further, the government may consider encouraging banks to generate more liquidity by modifying regulations concerned with market power or reinforcing policies about improving the transparent business environment.

This study characterizes an attempt to examine the influence of market power on the liquidity creation of banks in Vietnam, which represents one of the most dynamic systems in Asia, with several varied participating banks. The current study also examines the same within the specific context of the modifying impact of the profitability of banks.

The purpose of this paper is to estimate the cost and profit efficiency (PE) of Chinese commercial banks in the last ten years and investigate how market power affects bank efficiency and stability.

The paper builds a stochastic frontier analysis model to evaluate the cost and PE of commercial banks. The paper then uses a Lerner index and Z-index to represent market power and stability, respectively. In addition, the paper empirically analyzes the relationship between market power and bank efficiency, stability in the last ten years.

The results show that the efficiency of banks on the Chinese mainland increased during the study period, but is still lower than that of banks in Hong Kong; moreover, the efficiency of four state-owned commercial banks is lower than that of medium and small banks. Market power has a negative relationship with efficiency while its relationship with stability varies among Chinese banks.

The results imply that the promotion of financial liberalization and banking reform to introduce an appropriate competition mechanism has had a positive effect on the efficiency and stability of Chinese commercial banks.

Thus, the paper will contribute to deepen reform and opening up the banking sector in China.

The healthy development of banking can enhance the ability of banks to withstand financial risks, to promote the harmonious development of society.

The paper estimates the cost and PE of Chinese commercial banks using SFA model and investigates how market power affects bank efficiency and stability. The study design has a certain novelty, where Lerner index and Z index are used, respectively, to measure market power and stability and management efficiency of commercial banks is investigated from two aspects – PE and cost efficiency – by the translog cost function, instead of Douglas production function. In addition, the paper tries to put some of Hong Kong banks included in the study sample, and has a certain reference value.

This paper aims to explore the relationship between bank market power and stability of financial institutions in Italy between 2001 and 2012. The authors first test the existence of a U-shaped relationship between market power and financial stability. Second, they regress the market share indicator on bank risk-taking to underline whether financial stability is affected by increasing or decreasing the market power of banks. Third, they explore whether this relationship is affected by the size, level of capitalization and credit insolvency of banks.

Relying on highly territorially disaggregated data at labor market areas level, the authors estimate the impact of bank market power and other explanatory variables on a proxy of risk taking behavior such as the banking “stability inefficiency” derived simultaneously from the estimation of a stability stochastic frontier. Bank market power is taken into account through an individual measure based on loans. Financial stability is calculated through the Z-score. The authors use, as risk-taking measure, the stability inefficiency whose estimation approach is the stochastic frontier analysis.

The empirical evidence shows that the inefficiency of financial stability is found to be U-shaped related with respect to the measure of market power. Bank size is an essential factor in explaining the relationship between bank market power and risk-taking. Cooperative banks have fewer incentives to gain market power to better perform in term of risks. The reform of the cooperative banks that took recently place in Italy is not supported by the data.

The relationship between bank market power and financial stability has been analyzed using a rich sample of cooperative, commercial and popular banks in Italy over the 2001-2012 period. The authors rely on labor market areas being sub-regional geographical areas where the bulk of the labor force lives and works. The paper investigates the market power-stability link considering both cooperative and non-cooperative banks. Indeed, specific attention has been paid on cooperative banks because of their mission in favor of the local community as only few studies, to the best of the authors’ knowledge, examine cooperative banking.

The expansion of the Islamic banking industry seems to accentuate the banking competition in MENA and Southeast Asia where conventional and Islamic banks coexist. In this context, the research aims\ to examine the competitive conditions and the market power of the conventional and Islamic banks during the period 2004-2009 in MENA and Southeast Asia region.

The authors use a variety of structural and non-structural measures related to the traditional approach and the new empirical approach of the industrial organization. The methodology is based on set of measures of the competition and market power. The first measure is a set of concentration ratios (C3, C5) and Herfindahl-Hirschman index (HHI). The second measures are the Panzar and Ross H statistic and the Lerner index based on econometric estimations with the aim of evaluating the structure of market and measuring its power in terms of price setting.

The results indicate that under the HHI index, both markets are low concentrated, while according to the concentration ratios, the Islamic market is considered as moderately concentrated. The estimations results, through the H-PR-statistic of Panzar and Ross related to degree of competition and the Lerner index of market power, indicate that both markets are characterized by a monopolistic competition and the Islamic banking expressed a high degree of market power.

The research focuses exclusively on the countries where the data are available and excludes the other countries where competition and market power might have different forms.

In a competitive environment, each bank is required to analyze the structure of its market and competitive conditions, in order to develop a business strategy and effective action plans. In the context of the multiplication of the Islamic banks in the MENA and Southeast Asia, the enhancement of Islamic bank competitiveness by offering new products is determinant for their success.

To the best of the authors' knowledge few studies have examined this subject in a comparative analysis between the Islamic and conventional banks. So the authors contribute to the literature on Islamic banking by considering a sample of Islamic and conventional banks operating in the same countries in order to examine the existence or not of difference between them.

This paper investigates the relationship between market power and efficiency for Indian banks in order to test the validity of the quiet life hypothesis (QLH) during 2005–2019.

First, the bank-level DEA efficiency scores and three measures of the Lerner index: traditional, efficiency-adjusted, stochastic are estimated. Then, efficiency scores are regressed on Lerner indices plus a set of banking and economic control variables.

Robust evidence against the QLH is obtained. Moreover, the conventional Lerner index suggests that market power of Indian banks, as well as of the different bank groups, increased during the study period, due to a greater reduction in costs compared to that of the price of banking services. The efficiency scores also declined for the banking system as a whole, and for all bank groups except new private banks.

This is the first study testing the QLH for the different categories of Indian banks and also provides robust inferences by using both stochastic and non-stochastic measures of market power.

The paper attempts to analyze vertical product differentiation as a strategy pursued by European banks seeking greater market power and higher reputation for quality, and to examine whether this entails losses in banking efficiency.

First, the empirical analysis seeks to demonstrate whether borrowers at banks in Europe are willing to pay a premium to operate with banks that attempt to increase their reputation for quality in the market, i.e. whether banks use quality to vertically differentiate and so soften competition. To test such hypothesis requires us to define an empirical model with variables that describe certain characteristics of banking quality as explanatory variables of the loan interest to the market interest rate margin. This model is estimated by two stage least squares. Second, the paper seeks to test whether the market power derived from vertical product differentiation (quality reputation) prevents banks from operating efficiently. To test this hypothesis first we estimated cost efficiency taking into account bank risk preferences and then we define an empirical model that relates the results on efficiency with the margin of interest loan rate over the market interest rate.

The results show that less competition, deriving from a bank's ability to differentiate its services from those of its rivals through quality, is positive because it helps to provide a more stable banking system. Moreover, the banking market power generated by investing in quality does not prevent banks from operating efficiently from a production point of view.

The findings are consistent with the view that European banks soften competition by being more stable, and this does not prevent cost efficiency. So it seems that the regulatory authorities should improve their solvency measures since borrowers’ preferences are to maintain relationships with non‐fragile banks, and on the other hand banks’ risk preferences seem to be to look for sound borrowers.

Frontier cost efficiency scores that account for bank's risk preference are able to be related with customer preferences based on the model of the industrial organization (10) based on vertical product differentiation in banking.

This is the first paper that relates vertical product differentiation with the results obtained from the literature on x‐efficiency. It is also the first paper that studies the impact of banking market power jointly with cost efficiency in social efficiency when market power comes as result of investing in reputation for banking quality.

This paper examines the effect of financial (banking) freedom and market power on bank net interest margins (NIM).

The study uses data from 11 sub-Saharan African countries over the period, 2006-2012, and the system generalized method of moments to assess how financial freedom affects the relationship between market power and bank NIM.

The authors find that both financial freedom and market power have positive relationships with bank NIM. However, there is some indication that the impact of market power on bank margins is sensitive to the level of financial freedom prevailing in an economy. It appears that as competition intensifies, margins of banks in freer countries are likely to reduce faster than those in areas with more restrictions.

Competition policies could be guided by the insight on how financial freedom moderates the effect of market power on bank margins.

This study provides new empirical evidence on how the level of financial freedom affects bank margins and the market power-bank margins relationship.

The purpose of this paper is to examine the competitive conditions and market power of Islamic banks in Indonesia for the period of 2006-2013.

Using samples of 27 Islamic banks, the study uses a variety of structural and non-structural measures related to the traditional approach and the new empirical approach of the industrial organization. The methodology is based on a set of measures of the competition and market power. The first measures, concentration ratios and Herfindahl–Hirschman index, are to determine the competitiveness level, while the second measures of Panzar–Rosse H-statistic and Lerner index are to examine the market power of Islamic banks in Indonesia.

The finding of this study has confirmed the situation of Islamic banking industry in Indonesia which is operated in a higher degree of market power which leads to a less competitive market. Islamic banks earn their revenues under monopolistic competition over the tested period. This study has also found a negative but insignificant relationship between concentration and competition which shows that in the past few years, the market power for leading firms in Indonesia Islamic banking industry has reduced.

The paper is a very useful source of information that may provide relevant guidelines in guiding the future development of competition of Islamic Banking industry. In addition, the paper provides relevant guidelines for improving competitiveness of Islamic banks.

This study combines two approaches for bank competition measurement and bank market powers measurement which can provide more robust findings. To the best of the authors’ knowledge, the study on Islamic banking competitiveness level and market power is very limited, especially in the case of Indonesia. Therefore, this study could contribute significantly toward the literature of the related field.

This study aims to consider the effect of financial (banking) freedom and competition on bank efficiency.

With data from 11 Sub-Saharan African countries over the period 2006-2012, the study estimates both competition (market power) and bank cost efficiency using the same stochastic frontier framework. Subsequently, Tobit models, including instrumental variable Tobit regression, are used to assess how financial freedom affects the relationship between competition and bank efficiency.

The results show that increase in market power (less competition) leads to greater bank cost efficiency, but the effect is weaker with higher levels of financial freedom. This is not consistent with the quiet life hypothesis.

Policymakers usually take the view that opening up banking markets to greater competition may lead to higher efficiency. However, the results have shown that allowing banks to maintain some level of market power may be necessary to ensure banking system efficiency.

This study deepens the understanding of the inconsistent relationship between competition and bank efficiency, by using the same framework to measure both competition and efficiency, and by providing new empirical evidence on how the level of financial freedom affects this relationship.