One major role that the government plays in the market economy of the u. s. is: requiring minimum levels of employment in major industries setting production targets for major industries allocating resources in various market activities setting laws governing economic activity

One major role that the government plays in the market economy of the u.s. is:  setting laws governing economic activity
The only purpose for a government in a market economy is to make sure that all the people in that country are competing FAIRLY. They could do this by creating some taxation, export/import, and quality regulations

Money believe but i may be wrong