The provision and design of deposit insurance systems presents governments with an unprecedented set of challenges. Deposit insurance systems are typically motivated by a desire to decrease the risk of systemic bank runs (e.g., Diamond and Dybvig (1983)) and to protect small, uninformed depositors (e.g., Dewatripont and Tirole (1994)). Often, however, they are blamed for increasing the incentives of banks to take excessive risk by reducing, or even completely eliminating, the incentives of depositors to monitor and discipline their banks (e.g., Kane (1989) and Calomiris (1999)).
Market discipline by depositors is commonly understood as a situation in which depositors penalize riskier banks by requiring higher interest rates or by withdrawing their deposits (i.e., a leftward shift in the supply of deposits when bank risk increases). The main challenge policymakers are facing is how to design a deposit insurance scheme that protects the financial system from systemic bank runs without unduly reducing market discipline. To date, however, there is very little empirical evidence on the effects of implicit or explicit deposit insurance on market discipline, and there is even less evidence on how various design features of a deposit insurance scheme might affect market discipline. This paper investigates these questions in a natural experiment setting.