The following post comes to us from Henk Berkman, Professor of Finance at the University of Auckland; Paul Koch, Professor of Finance at the University of Kansas; and Joakim Westerholm of the Finance Discipline at the University of Sydney.
In our paper, Informed Trading through the Accounts of Children, forthcoming in the Journal of Finance, we introduce a novel measure of the probability of information-based trading in a stock, namely, BABYPIN, the proportion of total trading through the accounts of underaged investors. We begin by empirically validating this measure by showing that underaged accountholders are extremely successful at picking stocks, especially when they trade just before large price changes, major earnings announcements, and takeover announcements. We next show that BABYPIN is priced in the cross section of stock returns, consistent with Easley and O’Hara (2004).
There are two reasons to expect a high proportion of informed trading through underaged investor accounts. First, guardians who open accounts and trade on behalf of young children are likely to be above-average investors. We expect these individuals to have more wealth (to bestow on offspring) and to be more successful at investing, possibly due to superior cognitive skills or comparative advantages in obtaining value-relevant information. These attributes, combined with a basic parental instinct to share the benefits of any information advantage with one’s offspring, could lead to a disproportionate number of underaged accounts that bear the fruits of informed trading.
