In a prisoner's dilemma game, the dominant strategy for each player is to defect, regardless of the other player's choice. This is because each player's payoff is higher if they defect, even if the other player cooperates.

The Nash equilibrium in a prisoner's dilemma game is (Defect, Defect). This is because each player's best response to the other player's strategy is to defect, regardless of the other player's choice.

The tit-for-tat strategy in a prisoner's dilemma game is to cooperate on the first move, then do whatever the other player did on the previous move. This strategy is often successful in promoting cooperation because it punishes defectors and rewards cooperators.

The grim trigger strategy in a prisoner's dilemma game is to cooperate until the other player defects, then defect forever. This strategy is often successful in promoting cooperation because it punishes defectors severely.

A public goods game is a game in which each player's payoff depends on the actions of all other players. This is in contrast to a private goods game, in which each player's payoff is independent of the actions of all other players.

The free rider problem in a public goods game is the problem that arises when some players do not contribute to the public good. This can lead to a situation where the public good is not provided at all, or is provided at a lower level than is optimal.

There are a number of mechanisms that can be used to overcome the free rider problem in a public goods game. These include coercion, persuasion, and reputation.

The voluntary provision of public goods is the provision of public goods by individuals or groups without being coerced to do so. This can be done through donations, volunteering, or other forms of cooperation.

There are many examples of voluntary provision of public goods. Some common examples include open source software, Wikipedia, and public parks.

There are a number of benefits to voluntary provision of public goods. These include a more efficient provision of public goods, a more equitable distribution of public goods, and a more sustainable provision of public goods.

There are a number of challenges to voluntary provision of public goods. These include the free rider problem, the coordination problem, and the information problem.

There are a number of ways to overcome the challenges of voluntary provision of public goods. These include government intervention, community-based initiatives, and public-private partnerships.

Cooperation is a key concept in experimental economics. It is used to study how people interact in strategic situations, how they make decisions under uncertainty, and how they learn from experience.

Experimental economics research on cooperation has found that people are more likely to cooperate when they are able to communicate with each other, when they are able to see the benefits of cooperation, and when they are able to punish defectors.

Experimental economics research on cooperation can be used to inform policy by providing insights into how people make decisions in strategic situations, how they learn from experience, and how to design institutions that promote cooperation.