11. the answer is...

capitalist economy
market economy

The economic system of the United States is capitalism. In the American economy, most business are privately owned. Competition and profit motivate businesses. Businesses and consumers interact in the marketplace, where prices can be negotiated. This is called a "market economy." In a market economy, businesses decide what to produce, how much to produce, and what to charge. Consumers decide what, when, and where they will buy goods or services. In a market economy, competition, supply, and demand influence the decisions of businesses and consumers.