Essay

The Paradox of Self-Interest in Collective Action

Consider a scenario where four individuals can each choose to contribute to a public good. If an individual contributes, they incur a personal cost of $10. For every contribution made (including their own), each of the four individuals receives a benefit of $8.

  1. Construct a payoff table for one individual, showing their net payoff if they contribute versus not contributing, based on the number of other individuals who contribute (0, 1, 2, or 3).
  2. Analyze this table to determine if a dominant strategy exists for this individual. Explain your reasoning by comparing the payoffs for contributing and not contributing at each level of participation by others.
  3. Discuss the collective outcome if all four individuals act according to this strategy and compare it to the outcome if all four individuals had contributed. What does this reveal about the relationship between individual incentives and group welfare in this scenario?

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Updated 2025-08-12

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