Sarah Dunant looks at the queasy relationship between art, finance and corruption.

Recent protests by the photographer Nan Goldin and others over "dirty money" have hit the headlines.

But Sarah argues that without some of this rather dubious funding, the art world would look very different.

"What do you want", she asks. "A clean church and white walls? Because there's no doubt that without all of this lamentable corruption we would not have many of the greatest works of art the world has ever seen."

Producer: Adele Armstrong