We can get more goods and services by specializing in what we do best, and trading for the products that others make best. The carrot is better than the stick. If we want to get what a stranger has to offer, it is best to offer something in return. We can take what he has by force, but then he will stop producing. We can place heavy burdens on his output, but then he will trade with others.
Some strangers are very smart.
They try to figure out what goods and services we will want, and then do their best to cut the costs of production. When they fail, they sometimes suffer great losses. But when they succeed, they often become rich. And because we are the ones who use and enjoy their products, we also benefit. It is smart for us to let others work in freedom.