International banking has been an important driver of financial globalisation and integration, thus contributing to welfare gains over time and across countries. During the recent crisis, however, the plight of many internationally active banks epitomised the fragility of the financial system....

We model the impact of bank mergers on loan competition, reserve holdings and aggregate liquidity. A merger changes the distribution of liquidity shocks and creates an internal money market, leading to financial cost efficiencies and more precise estimates of liquidity needs. The merged banks...