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.

Donald Trump got almost 3 million fewer votes than Hillary Clinton! He happened to get more in some of the right places. It was just like one of those things where a stock going up and people impose a false sense of order on it. It's really more intellectually honestly viewed as a disorderly process.

People in the voting booth are not purely rational creatures any more than they're purely rational creatures outside the voting booth.

Don't be deceived by life's outcomes. Life's outcomes, while not entirely random, have a huge amount of luck baked into them.

People really don't like to hear success explained away as luck — especially successful people. As they age, and succeed, people feel their success was somehow inevitable. They don't want to acknowledge the role played by accident in their lives. There is a reason for this: the world does not want to acknowledge it either. If you use better data, you can find better values; there are always market inefficiencies to exploit, and so on. But it has a broader and less practical message: don't be deceived by life's outcomes. Life's outcomes, while not entirely random, have a huge amount of luck baked into them. Above all, recognize that if you have had success, you have also had luck — and with luck comes obligation.

Every form of strength is also a form of weakness.

It's such a pain in the ass to write a book, I can't imagine writing one if I'm not interested in the subject.