I think this is referring to a widely used mental model in economics whereby you look at the allocation of resources "other than money". So if you look at a pi

I think this is referring to a widely used mental model in economics whereby you look at the allocation of resources "other than money". So if you look at a piece of farmland, you look at how many people it feeds and not so much at the fact that person X owns it and person Y needs to pay X for food. The fact that X becomes richer as a side-effect of Y not having to starve triggers our sense of injustice, but at the end, what really matters is that everyone gets fed. If, trying to right such injustices, you end up with an economic system where that piece of land feeds fewer people, you might have done yourself a disservice.