This paper attempts to assess the degree of competition in Thailand’s banking system, and examine the evolutionary effect of bank regulations. Furthermore, this paper investigates how a change in competition can affect the monetary policy on bank lending channel in Thailand. This study employs panel data from ten commercial banks over quarterly time periods from 2001–2015. The competition variable is measured using the Lerner index. Bank regulations can be divided into four groups: (i) restrictions on banking activities, (ii) limitations on foreign ...