If you're going to start a business, it must pass three basic tests, says the CEO of global private equity firm The Blackstone Group.<p><i>The following excerpt is from</i> <i>Stephen A. Schwarzman's book</i> <i></i>What It Takes: Lessons In the Pursuit of Excellence<i>. Copyright © 2019 by Stephen A. Schwarzman. Reprinted by</i> …
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