Why Do People Cooperate Despite Competition?

You compete, favor your own, take sides, guard your name, weigh now against later, and cheat when the incentives line up. And yet you cooperate every day. You hold the door for a stranger. You pay before you receive. You tip a waiter in a city you will never see again. Billions of people do the same, without coercion and often at real cost to themselves.

This lesson is the synthesis that resolves the puzzle. You will learn the handful of conditions that make cooperation the winning strategy often enough to sustain marriages, marketplaces, and nations, and the sequence by which a cooperative arrangement breaks down once those conditions fail. You will leave able to look at any group and judge whether it will hold together or come apart.

The full account, which gathers every pattern in the course into one working model, waits inside the course.