The following video is part of our "Motley Fool Exclusive Interview" series. In this segment, Fool.com analyst Brendan Byrnes interviews author and Bloomberg reporter Jason Kelly about his recent book, The New Tycoons: Inside the Trillion Dollar Private Equity Industry That Owns Everything.

Many of the biggest private equity firms -- such as Blackstone, KKR, and Carlyle -- have been generating excellent returns for their limited partners over the past few decades. With many of these big private equity firms now public, retail investors might be tempted to purchase the stock as a result of that track record. Jason explains in the following video, however, why buying a P/E firm's stock and investing in one of its funds as a limited partner are two very different things.