Monetary policy transmission through the bank lending channel in Thailand

Abstract

This paper investigates the strength of the bank lending channel in the transmission of monetary policy in Thailand. Bank behavior is captured by quarterly balance sheet data for ten commercial banks of diverse size for the period 2007-2016. Based on a flexible form profit function, bank supply and demand equations are estimated that capture lending and funding choices. The estimation results are used to derive time-dependent supply and demand elasticities which are then combined with estimates of pass-through from the policy rate to retail rates to simulate the dynamic impact of a monetary tightening on bank portfolio allocations. Due to pass-through differentials among retail interest rates, an increase in the policy rate is shown to raise the cost of loan-production relative to the return on loans, thereby motivating banks to contract their lending. Small banks show a greater degree of loan contraction than large banks because large banks are better able to fund continued lending through debt issuance. Because the Thai economy relies heavily on bank loans, these findings suggest that the bank lending channel is an important conduit for the transmission of monetary policy in Thailand.