When humans team up with computers to play chess, the humans who do best are not necessarily the strongest players. They're the ones who are modest and who know when to listen to the computer. Often, what the human adds is knowledge of when the computer needs to look more deeply.

We're seeing an enormous amount of global upward mobility that's quite rapid and quite sudden, and undiscovered individuals have a chance - using the Internet, using computers - to prove themselves very quickly. So I think the mobility story will be a quite complicated one.

I think a lot of people will be liberated from a lot of oppressive manufacturing jobs, or a lot of service jobs, because they'll be done by computers. There'll be the world's best education available online and free.

The iPhone is made on a global scale, and it blends computers, the Internet, communications, and artificial intelligence in one blockbuster, game-changing innovation. It reflects so many of the things that our contemporary world is good at - indeed, great at.

There's so much free material on the Internet you can learn from, and some people are pure self-starters: they pick up computers and teach themselves everything. Certainly there are millions of people like that. But at the same time, I think it's a pretty small percentage of the population.

In chess, computers show that what we call 'strategy' is reducible to tactics, ultimately. It only looks creative to us. They are still just glorified cash registers. This should make us feel uncomfortable, whether or not we think computers will ever be good composers of music or artistic painters.

I sometimes say I am a 'happiness optimist' but a 'revenue pessimist.'

We will be returning to historical levels of inequality. We'll view post-war America as a kind of strange interlude not to be repeated. It won't be the dreams that we all had that virtually all incomes go up in lockstep at three percent a year. It hurts to give that up.

I think people who are not rich can be extremely happy. And I think the chances to be happy in this new world - with many more opportunities to be creative, to be online, to educate yourself - there'll be a lot more chances to be happy. It's not to say everyone will take them, but there will be a lot of new paths to opportunity.

Sports is remarkably cognitive. I think it's underrated just how smart it is. Actually, if I had more time, I would spend more time with sports. Watching it, reading about it, I think it's oddly underrated.

For the U.S., I think we should have a carbon tax, for environmental reasons.

The way to make the world a better place, through your eating, is simply to eat a bit less meat. Local is sometimes good, sometimes bad. But even when it's good, its environmental impact is relatively small compared to other possible improvements.

Economics is everywhere, and understanding economics can help you make better decisions and lead a happier life.