Amazon focuses its campus recruitment on schools with analytics and entrepreneurship programs, including Carnegie Mellon University's Tepper School of Business and the University of Michigan's Ross School of Business.

WSJ: What It's Like to Interview at Amazon

Groves is a Professor of Law at Florida Coastal School of Law, teaching business and sports courses and director of The Center for Sports and Social Entrepreneurship.

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The biggest risk in many of the current batch of deals is that the private-equity firms discover the cash-flow models to be less predictable than they thought, says Colin Blaydon of Tuck Business School's Centre for the Study of Private Equity and Entrepreneurship.

ECONOMIST: Media firms and private equity