The data used in this paper are similar to those used by BD, BMN, and
DRT. Requisite data are drawn from the 2002 Annual Industrial and Research
Compustat files. As do BD, we eliminate regulated firms as well
as financial institutions (SIC codes between 4400 and 5000 and between
6000 and 6500). In each of our analyses, we use all observations for which
we have complete data for the variables under consideration