We're just being flooded with content. And people are increasingly relying on recommenders to help them sort through it all.

There's a dark side. In the physical world, I bump into all kinds of people by chance. But online, if recommenders were perfect, I can have the option of talking to only people who are just like me. There's a danger that if we don't have some level of shared interaction, it can be destructive to our social cohesion.

Some people think it's a law that when productivity goes up, everybody benefits. There is no economic law that says technological progress has to benefit everybody or even most people. It's possible that productivity can go up and the economic pie gets bigger, but the majority of people don't share in that gain.

When I first started doing work on how the Internet is affecting commerce, like a lot of people, I was really excited by this nearly perfect market.

Retailing has gone from an information-scarce to an information-rich environment.

There are lots of examples of routine, middle-skilled jobs that involve relatively structured tasks, and those are the jobs that are being eliminated the fastest. Those kinds of jobs are easier for our friends in the artificial intelligence community to design robots to handle them. They could be software robots; they could be physical robots.