This book analyses the social pressure whereby groups solve the problem of collective action.

Preface; Acknowledgements; 1. The critical mass and the problem of collective action; 2. Building blocks: goods, groups and processes; 3. The paradox of group size; 4. The dynamics of production functions; 5. Social networks: density, centralization and cliques; 6. Selectivity in social networks; 7. Reach and selectivity as strategies of recruitment; 8. Unfinished business; References; Name index; Subject index.