A natural conjecture is that speculative trade disappears when individual beliefs become correct through learning. Sandroni in [22] gives a counterexample in an economy with sunspots. We generalize Sandroni's result by showing that the conjecture holds for economies with complete markets only....

We complement the conditional CAPM by introducing unobservable long-run changes in risk factor loadings. In this environment, investors rationally `learn' the long-level of factor loadings from the observation of realized returns. As a direct consequence of this assumption, conditional betas are...