The sports world is an echo chamber. All it takes is one quote from a general manager and a thousand sports columns bloom.

If you have a patient in a doctor's office who's just been told they have terminal cancer but there's this operation they could perform right now that might save their lives. ... They have a 90 percent chance of surviving the operation — if you tell them that, they respond one way. If you tell them ... that they have a 10 percent chance of being killed by the operation, they are about three times less likely to have the operation.

People in both fields operate with beliefs and biases. To the extent you can eliminate both and replace them with data, you gain a clear advantage.

People dislike uncertainty so much that they will impose an order on it even when it doesn't exist.

You want the book to be special, and they are not always going to be special, but at least you want that to be the ambition. So the only way that happens is if you are not pressing to write a book.

There are several insights at the heart of the A’s system that I think are wonderful for baseball. One, that it’s a team game. That no one player is going to make that much of a difference to your team, so for god’s sake don’t go blow a quarter of your budget on one guy.

The institutions at the centre of capitalism are bigger than they've ever been, the pay is much greater, the ability of society to get its arms around it is much less. The political clout of the financial class is unbelievable. I'd say the story is darker than when I was there. When I was there it felt like a comedy - and now it feels more like a tragedy.