We examine how parameter learning amplifies the impact of macroeconomic shocks on equity prices and quantities in a standard production economy where a representative agent has Epstein-Zin preferences. An investor observes technology shocks which follow a regime-switching process but does not...

We examine implications of introducing parameter uncertainty in endowment and production economies for index option premiums. We estimate two-state models of consumption and productivity growth using post-war U.S. data and allow for rational learning about unknown persistence of economic growth....