In my first essay, I examine how the quality of private information and the quality of public information contained in analyst revised one-year-ahead earnings forecasts issued right after a quarterly earnings announcement affect the post-earnings announcement drift (PEAD). I find that high precision of private information contained in revised forecasts reduces the level of PEAD and that the precision of public information contained in the revised one-year-ahead earnings forecasts partially offset the reduction in PEAD. Moreover, I find the effect of precision of private information on PEAD decreases after Reg FD, which required in the year 2000 that analysts could not contact the firm insiders to obtain private information. The results sugg...