Summary Table of Previous Research Empirical Evidence.


interest on deposits. In addition, the study uses independent factors: (1) bank characteristics including operating costs; liquidity; credit risk; non-interest income and (2) industry and macroeconomic characteristics including industry concentration; treasury bill interest rates. Furthermore, the study uses OLS regression method and finds that operating costs are positively correlated with net income gap of banks at 10% significance level. This result reflects that banks with higher operating costs will increase the net income gap of banks in the study sample. In addition, the remaining factors do not have a significant impact on the net income gap of banks.


Chirwa and Mlachila (2004) studied the determinants of net income gap of banks in Malawi by analyzing panel data of five commercial banks from 1989 to 1999. In this study, net income gap was measured as: (1) the difference between interest income on loans and interest expenses on customer deposits and (2) the ratio of net interest income to total assets. In addition, the study used the independent factors: (1) bank characteristics including credit risk; operating costs; bank size and (2) industry and macroeconomic characteristics including industry concentration; market liquidity; discount rate; inflation; industrial production index. Furthermore, the study used OLS regression method and found that credit risk; operating costs; bank size; banking industry concentration; discount rate; Inflation has a positive correlation with the net income gap of banks at the 10% significance level. This result reflects that the higher the credit risk of banks; the higher the operating costs; the larger the size of the banking industry; the higher the discount rate; the higher the inflation, the higher the net income gap of banks in the study sample. In addition, the industrial production index was found to have a negative correlation with the net income gap of banks at the 10% significance level. This shows that when the country has a higher level of industrial production, it will reduce the net income gap of banks.


Mujeri and Younus (2009) studied the determinants of net income gap of banks in Bangladesh by analyzing panel data of 48 commercial banks from 2004 to 2008. In this study, net income gap was measured by the difference between interest income on loans and interest expense on customer deposits and (2) the ratio of net interest income to total assets. Besides, the study used the independent factors: (1) bank characteristics including loan balance; operating expenses; bank size; non-interest income and (2) macroeconomic characteristics including deposit interest rate; inflation. Moreover, the study used OLS regression method and found that operating expenses; bank size and deposit interest rate are positively correlated with net income gap of banks at 10% significance level. This result reflects that banks with higher operating costs, larger scale, and higher deposit interest rates will increase the net income gap of banks in the research sample. In addition, outstanding loans and non-interest income are found to have a negative correlation with the net income gap of banks at the 10% statistical significance level. This shows that when banks lend more and earn more non-interest income, it will reduce the net income gap of banks.


Were and Wambua (2014) studied the factors affecting the net income gap of banks in Kenya by analyzing panel data of 31 commercial banks from 2002 to 2011. In this study, the net income gap was measured by the difference between the ratio of interest income to customer loans and the ratio of interest expenses to customer deposits. In addition, the study used independent factors: (1) bank characteristics including credit risk; bank size; operating costs; liquidity risk; profitability; net interest income;

(2) industry and macroeconomic characteristics including economic growth and monetary policy interest rates. Furthermore, the study uses OLS regression method and finds that bank size, operating costs, credit risk, profitability, net interest income and monetary policy interest rates are positively correlated with the net income gap of banks at 10% significance level. Results


This result reflects that banks with large scale; high credit risk; high operating costs; high profits; high net interest income and increased monetary policy interest rates will increase the net income gap of banks in the research sample. Besides, liquidity is found to have a negative correlation with the net income gap of banks at the 10% statistical significance level. This shows that the higher the liquidity of banks, the lower the net income gap of banks.


Mwamtambulo and Ntulo (2018) studied the determinants of net income gap of banks in Tanzania by analyzing panel data of 7 commercial banks from 2002 to 2009. In this study, net income gap is measured by the difference between interest income on loans and interest expenses on deposits. Besides, the study used independent factors of bank characteristics including liquidity; operating expenses; credit risk; non-interest income. Moreover, the study used OLS regression method and found that operating expenses are positively correlated with net income gap of banks at 10% significance level. This result reflects that banks with higher operating expenses will increase the net income gap of banks in the study sample. In addition, non-interest income was found to have a negative correlation with the net income gap of banks at the 10% statistical significance level. This suggests that when banks earn more non-interest income, it will reduce the net income gap of banks. Other factors do not have a significant impact on the net income gap.


Table 2.1: Summary table of previous research empirical evidence.


Study

Measuring net income variance

Research results

(Correlation with net income differential)

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Summary Table of Previous Research Empirical Evidence.


Angbazo (1997)

TNLT

∑Profit generating assets

- Banks with high bankruptcy risk; credit risk; high equity and holding many earning assets will increase the net income gap

- Banks with higher interest rate risk and holding more liquidity will reduce the spread.

net income

Maudos and Guevara (2004)

TNLT

∑ Assets

- The more competitive banks are, the higher their credit risk, the more equity they hold, the higher their bank liquidity and the higher their interbank market interest rates, the greater the difference in net income will be.

- Banks with larger size and higher operating costs will reduce the income gap.

net

Gunter et al. (2013)

TNLT

∑ Assets

- The more competitive banks are, the more they lend, the lower their costs.

The higher the staff; the higher the cost.




The higher the other activities; holding more risky assets; higher economic growth; higher short-term interest rates and higher long-term interest rates will increase the difference in net income.

- Banks with more customer deposits; larger fee and service income; higher Tier 1 capital; high credit risk and high inflation will reduce their leverage.

net income difference

Barajas et al. (1999)

TNTL CPTL

Loan Deposit

- The more competitive the banks are; the higher the staff costs and the higher the credit risk, the greater the net income gap will be.

- The more banks lend, the more the income gap will decrease.

net

Afanasieff et al. (2002)

TNTL CPTL

Loan Deposit

- Banks with higher operating costs and larger revenue from fees and services will increase the spread.

net income




- Foreign banks have lower net income gap than domestic banks.

domestic bank

Dabla – Norris and Floerkemeier (2007)

TNTL CPTL

Loan Deposit


And:

TNLT

∑ Assets

- Banks with higher operating costs; larger profits; more concentrated banking sector; more growing economy; higher interbank market interest rates and more volatile exchange rates will increase the gap in net income.

- Banks with larger scale; higher capital safety ratio; holding more liquid assets and earning more non-interest income will reduce the level of

net income difference

Khawaja and Din (2007)

TNTL CPTL

Loan Deposit

- Banks holding more liquid assets; competitiveness; credit risk; operating costs and high real interest rates will increase the net income gap.

- The economy grows then




will reduce the net income gap of the

bank

Maudos and Solis (2009)

TNLT

∑ Assets

- Banks with higher competitiveness; higher operating costs; higher equity; higher credit risk; higher market risk and holding more liquid assets will increase the net income gap.

- The better the management quality of banks, the higher the non-interest income and the larger the loan balance, the lower the spread.

net income deviation

Dumicic and Ridzak (2013)

TNLT

∑Profit generating assets

- The more equity banks have; the higher inflation; the more government debt and the more concentrated the banking sector, the greater the gap in net income.

- The more operating costs banks have, the more non-interest income they have;

hold more assets




liquidity; the higher the credit risk; the higher the interbank interest rate, the lower the income gap will be.

net import

Ramful (2001)

TNTL CPTL

Loan Deposit

- The higher the operating costs of banks, the greater the income gap.

net

Chirwa and Mlachila (2004)

TNTL CPTL

Loan Deposit


And:

TNLT

∑ Assets

- Banks with higher credit risk; higher operating costs; larger size; more concentrated banking industry; higher discount rates; higher inflation will increase the gap in net income.

- The higher the level of industrial production in a country, the lower the gap will be.

net income

Mujeri and Younus (2009)

TNTL CPTL

Loan Deposit


And

TNLT

∑ Assets

- Banks with higher operating costs, larger scale, and higher deposit interest rates will increase the difference in net income.

- Banks lend more and earn more income.

The larger the profit margin, the more

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