Andy Kessler has a good piece in the Wall Street Journal explaining how productivity improvements of the sort Bain Capital pursued help to create jobs:
In a competitive economy, productivity—doing more with less—always lowers the cost of products or services: $5,000 computers become $500 tablets. Consumers get to spend the difference elsewhere in the economy, and entrepreneurs will be happy to sell them what they want or create new things they never heard of, but will want. And those with capital will be eager to fund these entrepreneurs. Win, win.
The mechanism to decide the most effective use for this capital is profits. The stock market bundles profits and is the divining rod of productivity, allocating capital in cycle after cycle toward the economy's most productive companies and best-compensated jobs. And it does so better than any elite economist or politician picking pork-barrel projects and relabeling them as "investments."
The productive use of capital is not an automatic process, of course. It is all about constant experimentation. And it is never permanent: Railroads were once tremendously productive, so were steamships and even Kodachrome. It takes work, year in and year out—update, test, tweak, kill off. Staples is under fire from Amazon and other productive online retailers. Its stock has halved since its 2010 peak and is almost at a 10-year low. So be it.