Scarcity (cognitive)
Also known as: Bandwidth tax
Not having enough captures the mind, taxing attention and self-control.
What it means
Cognitive scarcity is the psychology of having too little — too little money, time, food, or social connection — and how that condition reshapes the mind itself rather than merely constraining options. The central claim is that scarcity captures attention, generating a tunneling that sharpens focus on the pressing shortfall while crowding out everything outside the tunnel, including longer-term planning and other obligations. This capture imposes a bandwidth tax: scarcity consumes cognitive resources, measurably reducing fluid intelligence and executive control, so people under scarcity make poorer decisions not because they are less capable but because their mental bandwidth is occupied. The framework reframes many behaviors of the poor — borrowing at high rates, neglecting maintenance, missing appointments — as predictable consequences of a depleted bandwidth rather than character flaws, and it predicts that the same person performs worse when scarce than when slack. It matters because it implies that easing cognitive load and timing demands away from moments of acute scarcity can improve decisions, complementing efforts to relieve the shortfall itself.
Examples
Sugarcane farmers performed worse on cognitive tests before harvest, when money was scarce, than after harvest when they were paid — the same people, taxed by scarcity, scoring as if they had lost IQ points.
A doctor running an hour behind tunnels on the queue and stops asking the questions that take time, missing the thing the rushed patient actually came in about.
In the week before payday, a parent forgets a friend's birthday and lets the car service slip — not carelessness, but a mind fully occupied by which bill can wait.
First described in Mullainathan & Shafir (2013); Mani et al. (2013).