How many cocoa beans would a loaf of bread cost? What about a pair of shoes? In the past, objects really were used as a means of payment in some parts of the world. For example, the Mayans, one of the oldest cultures in Central America, traded cocoa beans for food and clothing. In the third part of our series from the Money Museum, presenter Silviana Ursu takes a look at what constitutes money and the ways we pay today.