1. Stabilizing the economy- The presidential candidates have two separate views on this topic. This could cover anything from welfare, the wealthy paying more or less taxes, promoting economic growth, or anything involving the economy's flow of money.
2. Maintain Competition- The governments role here would be, to make sure one company doesn't take over all the other companies and forming a monopoly. AN example of this would be AT&T buying out T-Mobile, or United Airlines buying out Southwestern.
3. Provide Public Goods and Services- These are services that the market doesn't supply such as schooling, parks, roads, and public safety.
4. Maintain Legal and Social Framework- The governments role here, for example, would be to define and enforce property rights and establish a monetary system.