Making dough, and interacting. They are similar. The business world is not simply individuals seeking after self-interest. There are quite different explanations that could be offered, aside from that old standard explanation of things.
Capitalism exists when it has a society that it is based on, or when it has a basis in phenomena of a social kind. The most successful capitalist systems ---- the U.S., England, say Italy in the 12th century ---- they were also successful societies. Is that in any way surprizing?
Societies have persons who are interested in helping others. Economies have persons who are interested in what is in their pocket.
But an economy (in the modern sense) only succeeds where there is a successful society already present.