After data requirements to calculate accounting conservatism measures, supplier and customer bargaining power
proxies, and control variables used in our multivariate regressions (see details in Section 4), we are left with a final sample
of 7,064 firm-years over the 1995–2007 period. Table 1 shows the number of observations within each three-digit NAICS
industry group. Similar to the Compustat population, our sample consists of large proportions of computer and electronic
products producers (30%), chemicals producers (20%), and machinery producers (12%).