Final answer:
In a mixed-market economy, the government regulates businesses when necessary to protect consumers, enforce laws, prevent fraud, and ensure fair competition.
Step-by-step explanation:
A mixed-market economy is an economic system that combines elements of both a market economy and a command economy. In a mixed-market economy, the government regulates business when necessary. This means that the government intervenes in the economy to protect consumers, enforce laws, prevent fraud, and ensure fair competition. However, the level of government regulation in a mixed-market economy is typically lower compared to a command economy, where the government controls most aspects of the economy.