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....

The inability of standard intertemporal economic models under resonable values of the key parameters to generate the observed equity premium is termed as the equity premium puzzle. In order to resolve the puzzle, we propose a new approach based on worst-case analysis where agents make decisions...

It has been recognized that (i) decision makers' concerns about robustness affect prices and quantities; and (ii) uncertainty are generated by infrequent large shocks as well as continuous small shocks. An investor observes movements in variable levels but cannot perfectly distinguish their...