We are proposing something much more universal: Scarcity,in every form, creates a similar mindset. And this mindset can help explain many of the behaviors and the consequences of scarcity.
When scarcity captures the mind, we become more attentive and efficient. There are many situations in our lives where maintaining focus can be challenging. We procrastinate at work because we keep getting distracted. We buy overpriced items at the grocery store because our minds are elsewhere. A tight deadline or a shortage of cash focuses us on the task at hand. With our minds riveted, we are less prone to careless error. This makes perfect sense: scarcity captures us because it is important, worthy of our attention.
But we cannot fully choose when our minds will be riveted. We think about that impending project not only when we sit down to work on it but also when we are at home trying to help our child with her homework. The same automatic capture that helps us focus becomes a burden in the rest of life. Because we are preoccupied by scarcity, because our minds constantly return to it, we have less mind to give to the rest of life. This is more than a metaphor. We can directly measure mental capacity or, as we call it,
bandwidth
. We can measure fluid intelligence, a key resource that affects how we process information and make decisions. We can measure executive control, a key resource that affects how impulsively we behave. And we find that scarcity reduces all these components of bandwidth—it makes us less insightful, less forward-thinking, less controlled. And the effects are large. Being poor, for example, reduces a person’s cognitive capacity more than going one full night without sleep. It is not that the poor have less bandwidth as individuals. Rather, it is that the experience of poverty reduces anyone’s bandwidth.
When we think of the poor, we naturally think of a shortage of money. When we think of the busy, or the lonely, we think of a shortage of time, or of friends. But our results suggest that scarcity of all varieties also leads to a shortage of bandwidth. And because bandwidth affects all aspects of behavior, this shortage has consequences. We saw this with Sendhil and Shawn. The challenges of sticking to a plan, the inability to resist a new leather jacket or a new project, theforgetfulness (the car registration, making a phone call, paying a bill) and the cognitive slips (the misestimated bank account balance, the mishandled invitation) all happen because of a shortage of bandwidth. There is one particularly important consequence: it further perpetuates scarcity. It was not a coincidence that Sendhil and Shawn fell into a trap and stayed there. Scarcity creates its own trap.
This provides a very different explanation for why the poor stay poor, why the busy stay busy, why the lonely stay lonely, and why diets often fail. To understand these problems, existing theories turn to culture, personality, preferences, or institutions. What attitudes do the indebted have toward money and credit? What are the work habits of the overly busy? What cultural norms and constructed preferences guide the food choices of the obese? Our results suggest something much more fundamental: many of these problems can be understood through the mindset of scarcity. This is not to say that culture, economic forces, and personality do not matter. They surely do. But scarcity has its own logic, one that operates on top of these other forces.
Analyzing these scarcity traps together does not imply that all forms of scarcity have consequences of the same magnitude. The scarcity mindset can operate with far greater import in one context than in another. The structure of human memory , for example, can be used to understand everything from the trivial (why we forget our keys) to the important (the credibility of eyewitnesses) to the tragic (the onset of Alzheimer’s). Likewise, though the logic of scarcity can be similar across different