How is it that everyone in pharmaceutical companies runs self-employed businesses?

Everyone in a pharmaceutical company runs a self-employed business, which refers to a form of operation in which individuals operate and bear unlimited joint and several liabilities. Individuals are mainly classified according to enterprise types and organizational forms. Enterprises are divided into domestic capital and foreign capital according to their economic nature, and companies (joint stock companies, limited companies ……) and self-employed individuals according to their types and organizational forms. Organizationally speaking, self-employed individuals are a form of operation that operates independently and assumes unlimited joint and several liabilities. Economically, self-employed individuals are also domestic.