Taylor Begley, Amiyatosh Purnanandam, Kuncheng Zheng, 08 May 2015

A key regulatory response to the Global Crisis has involved higher risk-weighted capital requirements. This column documents systematic under-reporting of risk by banks that gets worse when the system is under stress. Thus banks’ self-reported levels of risk are least informative in states of the world when accurate risk measurement matters the most.

Jon Danielsson, Chen Zhou, 25 April 2015

Regulators and financial institutions increasingly depend on statistical risk forecasting. This column argues that most risk modelling approaches are highly inaccurate and confidence intervals should be provided along with point estimates. Two major approaches, value-at-risk and expected shortfall are compared, and while the former is found to be superior in practice, it is also easier to be manipulated by forecasters. 

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