With only a couple of exceptions -- a few more retailers, for example, and not as many wholesalers -- entrepreneurs are starting companies in pretty much the same business sectors that established companies are in. "I have an exercise I do with my class," says William B. Gartner, who teaches entrepreneurship at the University of Southern California. "It's this: Name an industry where there hasn't been a start-up in the last five years. You can't. Cars. Steel mills. Every industry has had some kind of entrepreneurial input. We fail to appreciate that when we think about what entrepreneurship means."
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