The feeling of scarcity can put people in a kind of cognitive tunnel, limiting what they are able to see. It depletes their self-control. It makes them more impulsive and sometimes a bit dumb. What we often consider a part of people’s basic character—an inability to learn, a propensity to anger or impatience—may well be a product of their feeling of scarcity. If any of us were similarly situated, we might end up with a character a lot like theirs. An insidious problem is that scarcity produces more scarcity. It creates its own trap.