Calibrating the Magnitude of the Countercyclical Capital Buffer Using Market-Based Stress Tests Staff Working Paper 2018-54 Maarten van Oordt How much capital do banks need as a buffer to absorb severe shocks? By using historical stock market data, market-based stress tests help estimate the magnitude of capital buffers necessary to absorb severe but plausible shocks. Content Type(s): Staff research, Staff working papers Topic(s): Financial institutions, Financial stability, Financial system regulation and policies JEL Code(s): G, G1, G10, G2, G21, G28