Our primary data source is the Standard & Poor's (S&P's) ExecuComp database from 1993 to 2011. ExecuComp records
compensation data on corporate executives (typically the top five executives) reported in proxy statements for the firms
comprising the S&P 1500 index.
ExecuComp assigns a unique identifier (EXECID) to each executive in the database, allowing us to track EXECIDs to locate
each executive's position across different firms over the sample period. We define an executive job-hopping event when one