A public good is one that will not be produced for individual profit, since it is difficult to get people to pay for its benefits. A public good is defined as an economic good which possesses two properties: Non excludable and non rivalrous. A free rider are people or firms that consume a public good without paying for it . How do we deter free riders? What is the cost (to society) of free riders? Give an example of a public good that has a large amount of free riders. How can we change this?