An anthropologist would disagree. Counter-examples are numerous. Ironically, individuals inside a corporation don't interact with each other via free market behavior. Friends, family, etc. Whole societies back in the day.
"I am, at the Fed level, libertarian;
at the state level, Republican;
at the local level, Democrat;
and at the family and friends level, a socialist."
The more complex social contexts don't stop operating just because you don't believe in them.