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In the Hunger Games, the purpose of the games is for pure enjoyment and entertainment. While in The Lottery, the purpose is to keep the the tradition that has been passed down from long ago.

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The purpose of the ritual in "The Hunger Games", is  entertainment. The kids are chosen to fight to the death for the Capital's enjoyment. The purpose of the ritual in "The Lottery" is to control the population. They also continue to do it because it is a tradition.

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The purpose of the ritual in  "The Lottery", is to keep the population under control. It is a tradition in that town. In "The Hunger Games", it's almost the same thing. But the capital also does it for a form of entertainment for them.