Ever since the fall of the Berlin Wall in 1989, the free market has dominated the world. Today we can buy and sell, lend and borrow, invest and trade from one end of the planet to the other like never before. It is exciting, and dangerous: the more the market grows and evolves, the easier it becomes to get lost in it. From the Alaba used-electronics market in Nigeria to the marriage market in People’s Square, Shanghai; from Tirumala Temple’s hair auction in India to a bank that uses cheese as collateral for cash in northern Italy, find your way through weights and scales, coins, customers, products and merchants, in pursuit of the invisible thread that links Wall Street to Main Street in one chaotic global market.