As a way of calculating the total cost of products I really like it.

Of course, determining what a "fair manufacturer's profit margin" would be is a whole other issue. According to the free-market theory every business would have a profit margin equal to the return on a perfectly safe security. For U.S. businesses, the annual return on a U.S. ten-year Treasury Bond could serve as a proxy for that. It is currently about two-thirds of one percent. Any rate of profit over that amount would be 'gravy'.

Another issue is income. I have a solution to offer for that: "For Crying Out Loud, ACCEPT That A SOLUTION Actually EXISTS" (a "3 min read"--including options for further reading--here in Medium). My frustration has hit hyper-drive. [As far as I can tell links are disabled in this new Response platform.]