The book highlights the paradox at the heart of collective action- that self-interest in the public domain is frequently counterproductive. National defense and clean air are things we all benefit from - they are public goods - but we tend to resist contributing to them. The first part of this book examines how government choice in such areas is shaped, and by whom- political entrepreneurs, bureaucrats, interest groups and ordinary citizens. McLean uses the idea of a public market in which politicians sell what they hope voters will buy, and further considers how and when people (and animals) co-operate to produce public goods even without government coercion. In the second part of the book the author examines the consequences of combining individual preferences, arguing that there is no straightforward way of adding them up to form a 'social ordering' and assesing the implications of this both for electoral reform and for the status of 'the will of the people'.