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.

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

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.

Often, economists spend their energies squabbling with one another, but arguably the more important contrast is between our broadly liberal economic worldview and the various alternatives - common around the globe - that postulate natural hierarchies of religion, ethnicity, caste and gender, often enforced by law and strict custom.

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.

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.

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.

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.

Vietnamese food has probably been saved from the mass market because most people never master the sauces and condiments that must be added to the food, at the table, for its glories to become apparent. It's too much trouble, and a lot of people don't like asking for help, especially if the interaction involves some linguistic awkwardness.

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.