Easter Seasonality and the Effect on the Stock Market

Easter seasonality is now with us, and according to the table included in this article, the fact that the S&P 500 Index (SPX) is positive on the year should make us quite optimistic for the rest of 2012.
A question often asked -- does the seasonal change marked by the Easter holiday, with the U.S. stock market closed on the preceding Good Friday, tend to produce anomalous returns? To...