Contents

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