The Size Distribution of the Banking Sector and Financial Fragility

We study the role of the size distribution of the banking sector for bailout policy and financial fragility in a model of financial intermediation with limited commitment and noisy sunspots. In particular, due to the different costs of mitigating depositors' losses, differences in financial fragility arise endogenously in the sense that the large banking market admits a higher degree of instability. Moreover, the desire to reduce differences in the amount of bailout funding across segments of the banking system leads the fiscal authority to collect less taxes ex-ante but ends up rendering the scope for run equilibria larger.