We derive theoretical expressions for market betas from a rational expectation equilibrium model where the representative investor does not observe if the economy is in a recession or an expansion. Market betas in this economy are time-varying and related to investor uncertainty about the state...

The Asset pricing literature has produced hundreds of risk factor candidates aimed at explaining the cross-section of expected excess returns, although risk factors which are in fact capable of providing independent information remains an open question. Appling a sparse model, Kozak, Nagel, and...