On September 15th 2008, the day of the Lehman Brothers' collapse, a contemporary art auction at Southeby's made over £111 million. Critic and filmmaker Ben Lewis looks at the distorting effect of the commercial art market and how it functions - who’s buying the art, who’s making the art and who’s selling the art. Is work by Damien Hirst valuable because it is good or because it is expensive? Who regulates the art market? Lewis returns to Southeby's a year on, to find out what's changed and to examine the future of art as a commodity.