Economic Research and Perspectives

Economic Research and Perspectives

The Impact of Banking System Liquidity Creation on Monetary Policy Tools: Evidence from the GMM-SYS Model

Document Type : Original Research

Authors
Neda Heydari 1
Amir Jabbari 2
hamid nasiri 3
1 Master’s Student in Economics, Department of Economics, University of Zanjan, Zanjan, Iran
2 Assistant Professor in Economics, Department of Economics, University of Zanjan, Zanjan, Iran
3 PhD Student in Economics, Department of Economics, University of Tabriz, East Azerbaijan, Iran
10.48311/ecor.2026.28265
Abstract
Abstract
This study investigates the impact of banking system liquidity creation on monetary policy tools in Iran. Using panel data from 17 state-owned and private banks over the period 2008–2023 and applying the System Generalized Method of Moments (System GMM) approach, we find that higher reserve requirements reduce liquidity creation, whereas banks’ indebtedness to the central bank increases it. Market concentration negatively affects liquidity creation, while bank size, inflation, and economic growth exert positive effects. The results suggest that central bank policies, market structure, and macroeconomic conditions jointly influence banks’ capacity to create liquidity
Purpose/Aims:
This study examines the impact of banking system liquidity creation on the effectiveness of monetary policy tools in Iran. It focuses on how banks’ financing structures, market concentration, and macroeconomic factors influence liquidity generation.
Methodology & Framework:
Using panel data from 17 active banks (state-owned and private) over the period 2008–2023, the System GMM was employed to estimate the dynamic effects of reserve requirements and banks’ indebtedness to the central bank on liquidity creation. Market concentration was measured using the Herfindahl–Hirschman Index (HHI).
Findings:
The results indicate that higher reserve requirements reduce banks’ liquidity creation, whereas greater indebtedness to the central bank increases it. Market concentration has a negative effect on liquidity creation. Inflation, economic growth, and bank size positively influence liquidity generation, while exchange rate fluctuations exert a negative effect.
Discussion:
Banks with diversified financing structures exhibit lower sensitivity to central bank policies. Larger banks are able to generate more liquidity due to greater financial resources. The policy implications suggest that maintaining balanced reserve ratios, reducing market concentration, stabilizing exchange rates, and closely monitoring macroeconomic conditions can enhance banks’ ability to create liquidity.
Conclusion & Implications:
This study demonstrates that central bank monetary policy tools significantly influence banks’ liquidity creation. The legal reserve ratio reduces liquidity by limiting banks’ resources available for lending and investment, whereas banks’ debt to the central bank positively affects liquidity, as banks rely on central bank facilities to meet their funding needs. Market concentration, measured by the HHI, negatively impacts liquidity creation, as highly concentrated markets limit competition and reduce banks’ capacity to extend loans and diversify financial products.
Macroeconomic factors such as inflation and economic growth also play important roles. Inflation and economic growth enhance liquidity creation by increasing loan demand, deposit mobilization, and banks’ financial capacity. Larger banks are better able to generate liquidity due to greater capital strength and access to funding facilities, whereas exchange rate volatility has a negative effect by increasing economic uncertainty and financing costs.
The policy implications suggest that the central bank should actively monitor banks’ indebtedness, maintain balanced reserve ratios, and implement measures to reduce market concentration and promote competition. Controlling inflation and stabilizing exchange rates can further support banks’ capacity to create liquidity. Overall, effective liquidity creation depends on the interaction among monetary policy, banking market structure, and macroeconomic conditions
Keywords
Bank Liquidity Creation, Banks&‌‌‌‌rsquo
Debt to the Central Bank, GMM-SYS Model, Herfindahl&‌‌‌‌ndash
Hirschman Index, Monetary Policy
Subjects
Reference
Acharya, V. V., & Naqvi, H. (2012). The seeds of a crisis: A theory of bank liquidity and risk-taking. Journal of Financial Economics, 104(3), 1-20. https://doi.org/10.1016/j.jfineco.2012.05.014.
Benigno, P., Chmielowski, P., & Apanasil, O. (2024). The role of banks in the monetary policy transmission mechanism with emphasis on banking characteristics. Journal of Economic Research, 12(4), 200-225.
Berger, A. N., & Bouwman, C. H. (2009). Bank liquidity creation, monetary policy, and financial crises. Journal of Financial Stability, 5(3), 1-19. https://doi.org/10.1016/j.jfs.2009.04.001
Berger, A. N., & Bouwman, C. H. S. (2017). Bank liquidity creation, monetary policy, and financial crises. Journal of Financial Stability, 30, 139-155. https://doi.org/10.1016/j.jfs.2017.05.001
Berger, A. N., & Sedunov, J. (2017). Bank liquidity creation and systemic risk. Journal of Financial Intermediation, 31, 17-38
https://doi.org/10.1016/j.jfi.2017.01.002
Bernanke, B., & Blinder, A. (1992). The Federal funds rate and the channels of monetary transmission. American Economic Review, 82, 901-921. https://doi.org/10.1257/aer.82.4.901
Bernanke, B., & Gertler, M. (1995). Inside the black box: The credit channel of monetary policy transmission. Journal of Economic Perspectives, 9(4), 27-48. https://doi.org/10.1257/jep.9.4.27
Bernanke, B. S., & Blinder, A. S. (1988). Credit, money, and aggregate demand. American Economic Review, 78(2), 435-439
https://doi.org/10.1257/aer.78.2.435
Blanchard, O. J. (2013). Macroeconomics (6th. ed.). Pearson.
Borio, C., & Zhu, H. (2008). Capital regulation, risk-taking and monetary policy: A missing link in the transmission mechanism?. BIS Working Papers, 268.
Chatterjee, S. (2018). The relationship between bank liquidity creation and recessions in the United States: 1984-2010. Journal of Financial Economics, 134(2), 345-367.
https://doi.org/10.1016/j.jfineco.2018.02.004
Chmielowski, P. (2024). The impact of monetary policies on bank liquidity creation: The role of bank characteristics. Journal of Economic and Financial Research, 10(2), 123-145.
Dang, V. D., & Huynh, J. (2022). Bank funding, market power, and the bank liquidity creation channel of monetary policy. Research in International Business and Finance, 59, 101-115
https://doi.org/10.1016/j.ribaf.2021.101115
Davydov, D., Hüser, A. C., & Parlatore, C. (2018). Interbank markets and bank capital regulation. Journal of Financial Economics, 130(1), 180-19. https://doi.org/10.1016/j.jfineco.2018.06.002
Delis, M. D., & Kouretas, G. P. (2011). Interest rate shocks, competition and bank liquidity creation. Journal of Banking & Finance, 35(12), 1-15
https://doi.org/10.1016/j.jbankfin.2011.07.005
Engle, R. F., & Granger, C. W. J. (1987). Co-integration and error correction: Representation, estimation, and testing. Econometrica, 55(2), 251-276
https://doi.org/10.1016/0304-4076(87)90068-0
Enders, W. (1995). Applied Econometric Time Series. Wiley.
Fidrmuc, J., Fungácová, Z., & Weill, L. (2015). Does bank liquidity creation contribute to economic growth? Evidence from Russia. Open Economic
Review, 26, 479-496.
https://doi.org/10.1007/s10290-015-0226-8
Friedman, M., & Schwartz, A. J. (1963). A Monetary History of the United States, 1867-1960. Princeton University Press.
Granger, C. W. J., & Newbold, P. (1974). Spurious regressions in econometrics. Journal of Econometrics, 2(2), 111-120.
https://doi.org/10.1016/0304-4076(74)90034-7
Gunji, H., & Yuan, Y. (2010). Bank profitability and the bank lending channel: Evidence from China. Journal of Asian Economics, 21(2), 129-141
https://doi.org/10.1016/j.asieco.2010.02.002
Heydari, Hadi, Zavarian, Zahra and Noorbakhsh, Iman. (2011). The effect of macroeconomic indices on non-performing loans. The Economic Research (Sustainable Growth and Development), 4, 43-65. [in Persian].
Hussain, M., & Bashir, S. (2019). The impact of banking competition on banks' risk-taking in Iran. Quarterly Journal of Business Management, 84, 343-360. [in Persian].
Jiménez, G., Ongena, S., Peydró, J. L., & Saurina, J. (2008). Hazardous times for monetary policy: What do twenty-three million bank loans say about the effects of monetary policy on credit risk-taking? Documentos de Trabajo, 82.
Kashyap, A. K., Rajan, R., & Stein, J. C. (2002). Banks as liquidity providers: An explanation for the coexistence of lending and deposit-taking. The Journal of
Finance, 57(1), 33-73.
https://doi.org/10.1111/0022-1082.00444
Khan, M., Ahmed, I., & Mahmood, H. (2016). The role of the bank lending channel in monetary policy transmission: Evidence from emerging economies. Journal of International Economics and Financial Policies, 8(3), 215-232. [in Persian].
Mishkin, F. S. (2016). The Economics of Money, Banking, and Financial Markets (11th. ed.). Pearson.
Mohseni Zonouzi, Seyed Jamaledin. (2017). Analyzing the importance of balance sheet channel in monetary transmission mechanism in Iran. The Economic Research (Sustainable Growth and Development), 4, 69-97. [in Persian].
Phillips, A. W. (1958). The relation between unemployment and the rate of change of money wage rates in the United Kingdom, 1861-1957. Economica, 25(100), 283-299.
Rajan, R. G. (2006). Has finance made the world riskier? European Financial Management, 12(4), 499-533.
https://doi.org/10.1111/j.1354-7798.2006.00336.x
Rahmani, T. (2021). Macroeconomics (Vol. 1). Noor Elm Publications.
Rokhim, R., & Min, B. S. (2019). Liquidity creation and bank risk-taking: Evidence from a transition market. Journal of Banking & Finance, 100, 1-15. https://doi.org/10.1016/j.jbankfin.2018.11.005
Sharifi Renani, H., Ghobadi, S., Amrollahi, F., & Honarouz, N. (2011). The impact of the asset price channel on monetary policy transmission in Iran (Case study: Housing price index). Quarterly Journal of Economic Modeling Research, (3), 29-44. [in Persian].
Taylor, J. B. (1995). The Monetary Transmission mechanism: An empirical framework. Journal of Economic Perspectives, 9(4), 11-26
https://doi.org/10.1257/jep.9.4.11
Tyler, R., Brown, P., & Stevens, H. (2019). The effects of monetary policy on bank liquidity through asset price changes. Journal of Financial Stability, 42,
118-133.
Valencia, F. (2014). Monetary policy, financial crises, and the business cycle. Journal of Economic Dynamics & Control, 47, 20-38.
https://doi.org/10.1016/j.jedc.2014.07.005
Walsh, C. E. (2010). Monetary Theory and Policy (3rd. ed.). MIT Press.
Wang, C., & Zhuang, L. (2022). Bank liquidity and the risk-taking channel of monetary policy: An empirical study of the banking system in China. PLoS ONE, 17(12), e0279506.
https://doi.org/10.1371/journal.pone.0279506
Yang, X., & Shao, Y. (2013). Implications of banking marketization for the lending channel of monetary policy transmission: Evidence from China.
 Journal of Macroeconomics, 38, 442-45.
https://doi.org/10.1016/j.jmacro.2013.06.002