The purpose of this study was to analyze the mediating role of bank efficiency in the effect of bank size on bank profitability. The research sample is 25 banks that have a minimum core capital of Rp. 5,000,000,000,000 and publish financial statements in full during 2010-2017. The data analysis technique in this study is path analysis (path analysis) with the help of AMOS software (Analysis of Moment Structure). The results of the study found that; 1) bank size has a positive and significant effect on bank efficiency; 2) bank size has a positive and not significant effect on bank profitability; 3) bank efficiency has a positive and significant effect on bank profitability. 4) bank efficiency is able to mediate the effect of bank size on bank profitability.

Purpose of this study is to obtain empirical evidence of the influence of market structure as measured by the Herfindahl-Hirschman Index (HHI) and Lerner Index, financial characteristics measured by capital, bank size on bank performance. The research sample is a Conventional Commercial Bank that has a minimum core capital of Rp. 5,000,000,000,000 and publishes financial statements in full during 2011-2018. Data analysis techniques in this study are panel data regression. The results showed that the Herfindahl-Hirschman Index proved to have a negative and significant influence on bank performance. The higher the Herfindahl-Hirschman Index shows the market structure that leads to a monopoly structure so that in general it will have an impact on decreasing bank performance. The Lerner Index proved to have a positive and significant influence on bank performance. It shows that when the monopoly power of individual banks increases, it will have an impact on the mastery of sources and assets owned by banks, which in turn will have an impact on increasing bank performance. Bank size and Capital proved to have a positive and significant influence on Bank performance.

This paper aims to identify the level of competition and the level of banking efficiency and develop a conceptual framework to examine the effect of the level of banking competition, the characteristics of banks on efficiency and competitive advantage of banking. To discuss the topic studied in this paper, the Literature Review method is used. The steps in creating a literature review are described as follows: First, determine the sources for the review literature material that is in accordance with the topic of this paper. Secondly, evaluating the contents contained in the sources of the literature study that was determined. Third, make a summary of the contents of the literature study resources. And fourth, explore new thoughts and ideas on topics that are subject to study to determine the positioning of the concept as the material for subsequent research. This finding shows that the level of competition, characteristics of banks influence in increasing competitive advantage through efficiency in the banking sector.

This study aims to analyze the factors that influence capital buffers in the banking industry in Indonesia. Research variables include bank size, liquidity, credit risk, efficiency and profitability as independent variables and capital buffers as the dependent variable. The method used in this study is quantitative research. This research was conducted at public banks on the Indonesia Stock Exchange category BOOK 3 and BOOK 4, with the 2014-2018 research period using multiple linear regression analysis techniques. The results showed that the size of the company did not have a significant effect on capital buffer, while liquidity, credit risk, efficiency and profitability had a significant effect on capital buffer.

The purpose of this study is to obtain empirical evidence of the effect of promotional costs on market share of third party funds and bank profitability (ROA). The sample using bank that publishes financial statements in full during 2010-2017 and is included in Books 3 and 4 categories related to business activities and office networks based on bank core capital. The data analysis technique in this study is path analysis with AMOS software (Analysis of Moment Structure). The results show that promotion costs have a positive and significant effect on DPK market share, promotion costs have a positive but not significant effect on bank profitability, market share deposits have a positive and significant effect on bank profitability. Promotion costs have a positive and significant positive effect on bank profitability through DPK market share.