The Today Programme on Radio 4 had a spell-binding interview with an economic historian who has devoted virtually the whole of his working life to creating national income statistics for the world economy - data that we can use today to enrich and deepen our understanding of why some countries grow faster than others. Click here for a discussion between Evan Davis and the historian Angus Maddison, Emeritus Professor at the Faculty of Economics at the University of Groningen. He explains how you can work out the GDP of the Roman Empire! And here is a link to his most important work.

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