In classical perfect and complete markets, prices form a Martingale and stock returns (or equivalently, successive price changes) are serially uncorrelated. However, there is considerable evidence in the finance literature showing that stock returns are serially correlated both in the short and...

The vast majority of reports written by sell-side equity analysts conclude with a reiteration of the analyst's existing recommendation on a firm's stock. Yet there is a disproportionate amount of research that focuses on the market reactions of changes in recommendations and a prevailing sense...