Contents

• 46. Each group fulfills a purpose
• 47. Groups define roles for their members
• 48. Roles often provide for specialization
• 49. Groups are often nested
• 50. Groups use a variety of social structures
• 51. Family is the foundational paradigm
• 52. Friends and colleagues expand the circle
• 53. Tribes organize even larger groups
• 54. Written culture allow groups to expand
• 55. Experts form peer groups
• 56. Multicultural societies include diverse subgroups
• 57. Groups pool their resources
• 58. Large groups require governance
• 59. We form preferences for particular structures
• 60. We generally trust fellow group members