The second programme in a six-part series investigating human economic history. Covers the period 650 BC to 450 AD. Peter Jay travels to Turkey, where he visits the metal workshops of Lydia where coins were minted some 2,500 years ago - the first form of currency that bears resemblance to the money in use today. He also examines the economy of Yap, a small, remote island in the Federated States of Micronesia, which has a range of ancient currencies still in use, strangest of which are large discs of limestone requiring several men to lift them. Greek and Roman coins are also explored.