A market economy is a system where people, businesses and organizations make their own decisions about what they want to buy or sell. In a market economy, the prices of goods and services are determined by the free interactions between buyers and sellers, and not by the government. People use their money to buy the things they need or want, and businesses use the money they get from selling things to pay their employees and to buy the things they need. This creates a cycle of buying and selling that helps the economy to grow.