In Masters of Money, produced in partnership with the Open University, BBC economics editor Stephanie Flanders examines how three extraordinary thinkers, Keynes, Hayek and Marx, helped shape the 20th century.

According to conventional wisdom, today's global financial crisis happened because markets were not regulated enough. But what if the opposite is true?

In the last of this series produced in partnership with The Open University, BBC Economics Editor Stephanie Flanders examines one of the most revolutionary and controversial thinkers of all. Karl Marx.