Predicted Outcome with Self-Interested Players in the Worldwide Public Good Game

Figure 4.14a: Deciding on a Contribution in the Worldwide Public Good Game

Imagine you are in a four-person group where each person, including you, is given $20 for a single round. You can contribute any amount of this $20 to a group project. For every $1 contributed to the project by any member, every person in the group (including those who did not contribute) receives a return of $0.40. Any money you do not contribute, you keep. You have a strong belief that the other three members of your group will each contribute exactly $10. To maximize your own personal financial payoff, what is the best action for you to take and what will your final payoff be?

Analyzing a Player's Decision in a Public Good Scenario

Consider a one-round scenario where four individuals are each given $20. They can secretly contribute any amount to a group project. For every $1 contributed to the project by anyone, each of the four individuals receives a return of $0.40. A player who wants to maximize their personal financial gain should contribute an amount equal to what they expect the other three players to contribute on average.

Explaining the Free-Rider Incentive

You are a participant in a four-person group activity. Each person is given $20. For every $1 contributed to a group fund by any member, every person in the group (including the contributor) receives $0.40. Assume the other three members contribute a total of $30 to the fund. Match each of your potential contribution choices with your correct final personal payoff.

Analyzing the Conflict Between Individual and Group Interests in a Public Goods Scenario

In a four-person public goods scenario, each person starts with $20. For every $1 contributed to a common pool, each of the four members receives $0.40. If the other three members contribute a total of $30, your personal payoff will be exactly $____ more if you contribute $0 than if you contribute your full $20.

A rational, self-interested player is participating in a one-round, four-person activity. Each person is given $20. For every $1 contributed to a group fund, every person in the group receives $0.40. Arrange the following steps in the logical order that the player would follow to decide their optimal contribution.

A participant in a four-person group activity is given $20. For every $1 contributed to a group fund by any member, every person in the group receives $0.40. The participant reasons: 'If all four of us contribute our full $20, the total fund will be $80. My personal return will be $80 × $0.40 = $32. Since $32 is more than the $20 I started with, it is in my personal financial interest to contribute my full $20, as long as everyone else does too.' From the perspective of maximizing one's own individual payoff, what is the primary flaw in this participant's reasoning?

A participant is in a four-person group activity that lasts for several rounds. In each round, every person is given $20 and can contribute to a group fund. For every $1 in the fund, each of the four members receives $0.40. After each round, all participants are told how much the other three members contributed. In Round 1, this participant contributes $10. In Round 2, after seeing that the other three members contributed a total of only $5 between them, the participant contributes $0. Which of the following best analyzes the participant's decision to contribute $0 in Round 2 from a purely self-interested financial perspective?