Nice quip. So what? Are you suggesting that today’s “rich” shouldn’t build homes with marble countertops because that will someday in the unforeseeable future be somehow absorbed by the “poor”?
No, the suggestion is that something that discourages building new homes for the rich now, will also have the future impact of reducing the amount of housing available for the poor. A building that houses rich people today could easily house middle class people in 25 years and poor people in 50 years as it becomes less desirable as it ages.
