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By Gideon Rachman

Published: September 6 2010 20:08 | Last updated: September 6 2010 20:08

When Paul Krugman, a Nobel prize-winning economist, clashed with Niall Ferguson, a famous historian (and FT contributing editor), over how best to respond to the economic crisis, Prof Ferguson's response was humorously humble. "A cat may look at a king,"� he wrote, "and sometimes a historian can challenge an economist."�

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