How much is an idea worth? In Uber’s case, $3.7 billion

How much is a great idea worth? In the case of Uber Technologies Inc, the answer is $3.7 billion. That’s the value of the stake held by Garrett Camp, the inventor of Uber, ahead of the company’s first day of stock trading on Friday. It’s an unfathomable sum, even for Camp, who was already an internet millionaire.