Contributor(s): Evan Davis, Professor Deirdre McCloskey | The Great Enrichment after 1800 increased the income of the poor by well over 900 percent. Professor Deirdre McCloskey does not believe that either bourgeois or Marxist economics can explain this phenomenon. Ideological change rather than savings or exploitation, she argues, created the affluence of the industrialised world. Professor Deirdre McCloskey is Distinguished Professor of Economics, History, English, and Communication at the University of Illinois at Chicago and Professor of Economic History, Gothenburg University, Sweden. She is the author of 16 books, the latest of which is Bourgeois Dignity: Why Economics Can't Explain the Modern World and around 400 scholarly pieces. Evan Davis @EvanHD is a presenter on BBC Radio 4's Today programme and a former BBC economics editor. He also presents The Bottom Line, a business discussion programme on BBC TV and radio and Dragons' Den, the BBC Two business reality show. Before joining the BBC, he worked as an economist at the Institute of Fiscal Studies and the London Business School. Analysis is BBC Radio 4's series about the ideas which influence policy and trends. Credits: Tom Sturdy (Audio Post-Production).