Abstract
We present new evidence on the macroeconomic effects of changes in microprudential bank capital requirements, using confidential regulatory data from the Basel I and II regimes in the United Kingdom. Our central result is that an increase in capital requirements lowered lending to firms and households, reduced aggregate expenditure and raised credit spreads. A financial accelerator effect is found to have amplified the macroeconomic responses to shifts in bank credit supply. Results from a counterfactual experiment that links capital requirements to house prices and mortgage spreads indicate that tighter macroprudential policy would have had a moderating effect on house price and mortgage lending growth in the early 2000s, with easier monetary policy acting to offset its contractionary effects on output.
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