It is well-documented that economies experience business cycles. Economic and financial activities fall sharply during recessions and rise sharply during booms. This phenomenon also gives rise to cyclical asset pricing implications: high asset prices (low returns) during booms and low prices...

We extends the aggregate risk modeling approach to include the regime switching risk triggered by a `regime shift' in economic conditions and to uncertainty aversion (robust control). We use a regime switching process rather than the popular diffusion-jump process for a number of reasons....