Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Assuming that individual investors account for most odd-lot transactions, we examine oddlot purchases and sales around the turn of the year and find a pattern that is related to the well-known January effect in stock returns. A significant change in the ratio of odd-lot sales to odd-lot purchases occurs at the turn of the year, which supports the hypothesis that the January effect results from trading by individual investors. The trading patterns that we find are not due entirely to tax considerations.