I’ve already mentioned the tendency of gift exchange to turn into games of one-upmanship, and how in some societies this potential is formalized in great public contests. This is typical, above all, of what are often called “heroic societies”: those in which governments are weak or nonexistent and society is organized instead around warrior noblemen, each with his entourage of loyal retainers and tied to the others by ever-shifting alliances and rivalries. Most epic poetry—from the Iliad to the Mahabharata to Beowulf—harkens back to this sort of world, and anthropologists have discovered
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