For some, the word "patriarchy" usefully describes our social and economic system with its manifest gender imbalances in wealth and power. For others, it is trendy, pretentious nonsense. In this programme we ask whether patriarchy helps or hinders our understanding of relations between men and women in the modern world. Evan Davis asks the founders of the women only AllBright Club why men aren't allowed to be members. And we take a trip Twycross zoo in search of a matriarchal society. Studio Guests: Catherine Colebrook is the Chief Economist at the Institute for Public Policy Research (IPPR). Charlotte Riley is a lecturer in twentieth century British history at the University of Southampton.