Mary Mellor, in a recent book, points out the social nature of money, as opposed to the traditional view according to which money is the outcome of individuals’ optimization. Claudio Sardoni argues that Mellor's view of money is not satisfactory. In particular, he questions Mellor's notion of ‘privatization of money’ and criticizes Mellor's approach. On the basis of Keynes, Sardoni proposes a different approach to money as a social phenomenon.