It's from the National Review but its the only thing I could find with a quick google search...apparently it's better for us not to know if they actually create jobs. I don't doubt that Bain can direct more money coming their way, but actual working jobs....
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A handful of academics including Harvards Josh Lerner and the University of Chicagos Steve Davis last year published a working paper titled Private Equity and Employment. It basically defied conventional wisdom on both sides, arguing that private equity investment only has a modest net impact on employment.
To arrive at that conclusion, the researchers constructed a dataset that relied on U.S. Census Bureaus Longitudinal Business Database (which is derived from IRS records). It then used Capital IQ and other financial sources to match up the LBD employment records with thousands of private equity transactions. In other words, while Bain Capital and other PE firms didnt keep track of their portfolio payroll data, the government did. And some academics connected the dots.
Unfortunately, it seems that access to the LBD is highly conditional. Lerner and Davis were required to use the data only in the aggregate, promising not to report any identifying information about any specific organization even if that organization was not specifically included in the LBD (i.e., financial sponsors). In fact, Census and the IRS screen all such working papers before they can be released, in order to make sure no identifying data is disclosed.
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http://www.nationalreview.com/media-blog/288051/how-many-jobs-did-bain-actually-create-greg-pollowitz