Jon Danielsson discusses the use of capital ratios and macroprudential regulation and describes the limitations of each policy: How banks can inflate capital ratios, how capital requirements fail to reduce the risk of aggregate shocks and how Basel III regulations burden smaller banks relative...

Large one-off events cause large changes in prices, but may not affect the volatility and correlation dynamics as much as smaller events. In such cases, standard volatility models may deliver biased covariance forecasts. We propose a multivariate volatility forecasting model that is accurate in...