The finance companies give loans for interest at higher rates, they also lend money from banks and others for cheaper rates, if necessary. The difference of interest between these two is their profit.
it manufactures or buys in large quantities and a low price and sells at a much larger price. The selling price is governed by the material cost, labour costs, etc these are classed as "on costs"....
Of course health insurance companies make a profit. And since they are publicly held companies, it's easy to see figure this out.
The key figure to watch is called "medical benefit ratio." Simply...