We study capital requirement regulation in a dynamic quantitative model in which nonfinancial firms, as well as households, hold deposits. A novel general equilibrium channel that operates through firms deposits mitigates the cost of increasing capital requirements. In the calibrated model, (a) the optimal capital requirement is 7.3 percentage points higher than in a comparable model in which all the deposits are held by households, and (b) setting the capital requirement higher than the true optimum is not as costly as one would gauge from the comparable model. We also provide some independent evidence that supports our novel channel.

We analyze competition and risk management at central counterparties (CCPs) using a granular transaction-level dataset, and find that CCPs decrease collateral in response to lower collateral at their competitors, an effect that becomes stronger as the correlation between positions increases. To interpret our findings, we derive a model in which collateral is driven by risk and CCP competition. Our results are consistent with the model and suggest that a single monopolistic CCP would require more collateral. We also show that amid the substantial increase in collateral during the Covid-19 pandemic, the probability of a margin breach did not significantly change.