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Venture capitalists aim to identify, fund, and profit from promising early-stage companies. They raise money from institutions and wealthy people, pool it into a fund, and invest in technology companies that they believe will become more valuable. If they turn out to be right, they take a cut of the returns —usually 20%. A venture fund makes money when the companies in its portfolio become more valuable and either go public or get bought by larger companies. Venture funds usually have a 10-year lifespan since it takes time for successful companies to grow and “exit.”

But most venture-backed companies don’t IPO or get acquired; most fail, usually soon after they start. Due to these early failures, a venture fund typically loses money at first. VCs hope the value of the fund will increase dramatically in a few years’ time, to break-even and beyond, when the successful portfolio companies hit their exponential growth spurts and start to scale. The big question is when this takeoff will happen. For most funds, the answer is never. Most startups fail, and most funds fail with them. Every VC knows that his task is to find the companies that will succeed. However, even seasoned investors understand this phenomenon only superficially. They know companies are different, but they underestimate the degree of difference.

The error lies in expecting that venture returns will be normally distributed: that is, bad companies will fail, mediocre ones will stay flat, and good ones will return 2x or even 4x. Assuming this bland pattern, investors assemble a diversified portfolio and hope that winners counterbalance losers. But this “spray and pray” approach usually produces an entire portfolio of flops, with no hits at all. This is because venture returns don’t follow a normal distribution overall. Rather, they follow a power law: a small handful of companies radically outperform all others. If you focus on diversification instead of single-minded pursuit of the very few companies that can become overwhelmingly valuable, you’ll miss those rare companies in the first place.

Excerpted from ‘Zero to One’ by Peter Thiel