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 be the case that the credit relation¿at least in the global North¿has replaced the wage relation as the key site of exploitation and political struggle? And finally, if precarity is indeed the name of today's proletarian condition, what possible future does it actually portend, what analysis does it require? Through a series of creative substitutions, in Portfolio Society Ivan Ascher extends Marx's critical project in bold and unexpected ways. Ascher not only explains some of the often mystifying processes of contemporary finance, he also invites us to consider what becomes of capitalism itself in those places where the relation of capital to its own future is now mediated by financial markets.