David Ricardo's famous economic model, predicts that if there are just two countries and two products both can be better off if they specialise and trade in the thing they’re relatively best at.

Transcript -- The Phillips Curve

Ever shaken an invisible hand? Been flattened by a falling market? Or wondered what took the bend out of Phillips' curve? David Mitchell helps reveal some of the great dilemmas faced by governments trying to run an economy - whether to save or spend, control inflation, regulate trade, fix exchange rates, or just leave everyone to get on with it and not intervene. You'll learn why Adam Smith put such a high price on free markets, how Keynes found a bold new way to reduce unemployment, and what economists went on to discover about the impact of policy on people's and businesses' behaviour - which may not always be entirely rational...