According to the Boesky-view, without the perpetual motion of greed, economies would stagnate. In other words, without wants pushing us, we'd just sit on our tails. Yet there's a hitch. Driven by greed, we turn economies into wars for acquisitions. As in the board game, a few win by sending the bill to everyone else.
Rents go up, as do taxes, fees, and costs.
It's not even a question for economic theory. Greed can take over any system, and it doesn't matter whether the system is capitalist, communist, or socialist. In the end, how we deal with greed goes beyond economic theories. It even goes beyond moral issues. The issue is philosophical.