"Mr. Kessler immediately pointed out two problems with this tally. Its based on current employment figures, not the period when Romney worked at Bain, and it does not include job losses from other companies with which Bain Capital was involved. Either problem, by itself, makes nonsense of the whole claim.
On the point about using current employment, consider Staples, which has more than twice as many stores now as it did back in 1999, when Mr. Romney left Bain. Can he claim credit for everything good that has happened to the company in the past 12 years? In particular, can he claim credit for the companys successful shift from focusing on price to focusing on customer service (That was easy), which took place long after he had left the business world?
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At this point, some readers may ask whether it isnt equally wrong to say that Mr. Romney destroyed jobs. Yes, it is. The real complaint about Mr. Romney and his colleagues isnt that they destroyed jobs, but that they destroyed good jobs.
When the dust settled after the companies that Bain restructured were downsized or, as happened all too often, went bankrupt total U.S. employment was probably about the same as it would have been in any case. But the jobs that were lost paid more and had better benefits than the jobs that replaced them. Mr. Romney and those like him didnt destroy jobs, but they did enrich themselves while helping to destroy the American middle class."
http://www.nytimes.com/2012/01/06/opinion/bain-barack-and-jobs.html?_r=1&hp