If you think about basic science or coming up with new theories of mathematics, these are not the kinds of things which are necessarily a well-defined market to pay people.

For a new payment product, you always have to ask, how much better is it than the current solution? So when we started Paypal, for eBay micro merchants, it was much better than getting the 7 to 10 days process of cashing a check in the mail. When you look at stores or physical worlds, places, a lot of these places are already set up to take cash or credit card. Apple Pay may be an incremental improvement, maybe a little bit better. But when you have something that's pretty good and you go to something that's perfect, sometimes it's very hard to drive adoption because the delta is not that big.

No company has a culture; every company is a culture.

The idea of becoming an entrepreneur is something that is not taught very well in school and is something that people should try to do earlier on.

I think markets are often not thinking on a long-time horizon, I think that our government structurally is doing even less so. When we have a government where we have people who are up for election at most once every six years for a U.S. senator, that's a time horizon that is much shorter than in a market that a company is looking at 10, 15, 20 years which is a time horizon over which a stock price is typically valued.

Luck is like an atheistic word for God.

Beginning with brand rather than substance is dangerous.