If the proposer earns the endowment rather than it being a windfall provided by the experimenter, self-interested behavior is much more prevalent.

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Quizplus · Accepted Answer

This is supported by research on the endowment effect, which shows that people value items they own more than identical items they do not own. When the endowment is earned, people feel a greater sense of ownership and are more likely to act in their own self-interest.

If the Proposer Earns the Endowment Rather Than It Being