As financial markets expand and continue to refashion the world in their own image, the wealth of capitalist societies no longer presents itself, as it did to Karl Marx in the nineteenth century, as a -monstrous collection of commodities.- Instead, it appears as an equally monstrous collection of financial securities, and the critique of political economy must proceed accordingly. But what would it mean to write Capital in the twenty-first century? Are we really to believe that risk, rather than labor, is now regarded as the true fount of economic value? Can it truly...