Modelling macroeconomic effects and expert judgements in operational risk : a Bayesian approach

This work presents a contribution on operational risk under a general Bayesian context incorporating information on market risk pro le, experts and operational losses, taking into account the general macroeconomic environment as well. It aims at estimating a characteristic parameter of the distributions of the sources, market risk pro le, experts and operational losses, chosen here at a location parameter. It generalizes under more realistic conditions a study realized by Lambrigger, Shevchenko and Wuthrich, and analyses macroeconomic e ects on operational risk. It appears that severities of operational losses are more related to the macroeconomics environment than usually assumed.