Donald MacKenzie in the London Review of Books:
Many people, especially on the political left, instinctively dislike the idea of emissions trading. Among the roots of this dislike is a variant of what the economic sociologist Viviana Zelizer calls the ‘hostile worlds’ doctrine. Her particular concern is with the worlds of economic relations and personal intimacy. In that context, the ‘hostile worlds’ doctrine is that the intrusion of economic considerations corrupts intimacy, and conversely that kinship and other intimate relations need to be stopped from corrupting what should be impersonal economic transactions. Zelizer questions whether the hostile worlds doctrine is right: for example, is paid care of children or of the elderly necessarily inferior to that provided by kin? Is your relationship to your children really damaged by paying them to hoover the house or clean the windows?