Quick note. Manufacturing companies make money by exploiting employees (m-c-m’ and all that). Their wealth comes from current employees and past employees, and in a way employees of other companies (in a somewhat direct way via capital invested which originated elsewhere and in an indirect way via both purchases made by other companies made with money derived from exploitation and perhaps via purchases made by workers). Companies then contract with insurers, or run their own in-house self-insurance plans (not 100% sure I want to say that self-insurance is insurance, of two minds here, I’m more in favor of saying that self-insurance is insurance even though vertically integrated). When in-house, it’s about minimizing the share of surplus value shared with other entities. When contracted via an insurance company, that company gets a share of surplus value produced by the manufacturers’ employees. Just as Adam Smith (I think, one of them classical pol econ cats, gotta check my notes) noted that really it’s workers that pay workers’ salaries, or rather provide the wealth controlled by capitalists from which a relative pittance is issued as the workers’ share, likewise workers pay for companies’ insurance. It’s bought with extracted wealth, and what’s bought is a market-based/commodified mechanism for maintaining/achieving relative security/stability of wealth (the value of current investments). Indirectly, in the sense of being mediated, workers insure their bosses, and themselves (to the degree that workers are insured in various ways), and to the degree that there are non-insurance risk-spreading mechanisms involved, this too is bought with extracted surplus value.