We study the macroprudential roles of bank capital regulation and monetary policy in a borrowing cost channel model with endogenous financial frictions, driven by credit risk, bank losses and bank capital costs. These frictions induce financial accelerator mechanisms and motivate the examination of a macroprudential toolkit. Following credit shocks, countercyclical regulation is more effective than monetary policy in promoting price, financial and macroeconomic stability. For supply shocks, combining macroprudential regulation with a stronger anti-inflationary policy stance is optimal. The findings emphasize the importance of the Basel III accords in alleviating the output-inflation trade-off faced by central banks, and cast doubt on the desirability of conventional (and unconventional) Taylor rules during periods of financial distress.

Interactions between loan-loss provisioning regimes and business cycle fluctuations are studied in a dynamic stochastic general equilibrium model with credit market imperfections. With a specific provisioning system, provisions are triggered by past due payments. With a dynamic system, both past due payments and expected losses over the whole business cycle are accounted for, and provisions are smoothed over the cycle. Numerical experiments with a parameterized version of the model show that a dynamic provisioning regime can be highly effective in mitigating procyclicality of the financial system. The results also indicate that the combination of a credit gap-augmented Taylor rule and a dynamic provisioning system with full smoothing may be the most effective way to mitigate real and financial volatility associated with financial shocks.