In 2006, the Fed asked its macroeconometric model what would happen if house prices dropped by 20%. The model projected the past into the future and said: “Not much.” Well, the financial crisis proved it wrong. Meanwhile, DSGE models, the main alternative up to this date, do not feature financial institutions; “They are not even good enough to be wrong,” says Doyne Farmer. That’s why Farmer and his team are developing an agent-based model, of the housing market first and of the entire economy next, to mimic the current financial crisis. The team collects data on actual people to calibrate a rich model with millions of interacting agents. This is a bottom-up approach to macroeconomics — this is new economic thinking.