This paper uses the supply side approach developed by Ibbotson and Chen to analyze average stock returns for the period 1926-2004. Using the quot;earningsquot; model variation, it is easy to see how each component, including real earnings growth and the P/E ratio, contributed to the average...

The costly trade theory predicts that it is much more difficult to exploit long-term private information than short-term. Thus, there is less long-term information impounded in prices. The managerial myopia theory predicts that a variety of short-term pressures, including inadequate information...