Earlier quoted context omitted.
The quality of life is not zero-sum, bot on a local level and a short timeframe, many things are indeed zero sum. The best example is land & desirable real estate. It only takes a few people with "outside" money to drive up prices in the market or to purchase land and sit on it in perpetuity, driving up prices by taking it out of the local supply.
From [0]: "Aquinas believed that it was specifically immoral to raise prices because a particular buyer had an urgent need for what was being sold [...] Aquinas would therefore condemn practices such as raising the price of building supplies in the wake of a natural disaster. Increased demand caused by the destruction of existing buildings does not add to a seller's costs, so to take advantage of buyers' increased wi…
So if I need my house painted, I should pay you a lot more if you do it with a toothbrush instead of normal painting equipment?
> the divorce of market value from labor
Which is simply a fact of life--often an unpleasant one, but a fact nevertheless. Market value--what someone else will trade for something you have--has nothing to do with how much labor you put in to whatever it is you have.