In a Capitalism economy people have more freedom, than in a Communism economy. The people are allowed to own their own business and control everything about that business. People have to work for their money.
The United States is one of many Capitalism countries, that is very successful.
Capitalism gives people a good work ethic, teaches them how to work for something and try to get what they want. There may be other alternatives but this is the best one for the people because it gets the people the most freedom.