It wasn't the only choice though. Maybe some members of the tribe used their free time to kill more salmon. Maybe they killed all the salmon because it was so good, or because they could bag the prettiest girl in the village because they had all the fish.
One way (song/dance/art), you are enhancing survival for the group and future generations. Another way (using survival skills to create excess), you are profiting in the short term.
Hundreds of years from now our era may be remembered as the generations that killed all the fish, and took all the paint brushes to make more fish hooks and spears.
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