Jeff Bezos

In 1997, Amazon went public and Wall Street was baffled: the company had never turned a profit and seemed determined not to. Bezos had quit a hedge fund job, driven cross-country, and written the business plan in the passenger seat, choosing books as a cold, rational first wedge. Through the dot-com crash, Amazon's stock fell around 90 percent and analysts asked whether it would survive. He kept spending.

For founders and operators, this case sharpens a brutal trade-off: what looks good this quarter versus what is right for the customer over the next decade. It asks whether you can tolerate years of criticism from people with shorter time horizons than you, and whether you have the nerve to be misunderstood on purpose. The operating mechanism Bezos used to force that clarity, and the lens he applied to every decision, is what the app keeps for you.