Margaret Thatcher's 1979 declaration that "there is no alternative" to neoliberal capitalism is more than a rallying cry: it's a straitjacket on our imaginations, constraining our ability to imagine what kinds of other worlds we might live in. But in science fiction, alternatives to market economies abound (and a surprising number of them are awarded prestigious awards by the Libertarian Futurist Society!), and it is through these tales that sociologist Peter Frase asks us to think through four different ways things could go, in a slim, sprightly book called Four Futures -- a book that assures us that there is no more business as usual, and an alternative must be found.