automatic enrollment in retirement plans

Automatic enrollment in retirement plans makes participation the default, so a worker must take action to opt out rather than act to join. The book presents this change in choice architecture as a practical response to a familiar gap: people say they intend to save for retirement, yet when saving requires a decision today, they may keep postponing it. By making saving easier and spending harder, the policy can convert individual intentions into higher participation and savings without imposing a mandate.

The problem of saving later

People often imagine they will save more in the future, even when they are unwilling to give up part of their income now. The difficulty is that their future preferences and circumstances are uncertain, and plans made today may not survive when tomorrow arrives: a person who expects to begin saving later may continue spending instead. When many people act on this pattern, individual difficulty becomes a collective problem, leaving them less prepared to live comfortably in retirement.

The book’s proposed response does not assume that people lack any desire to save. Rather, it treats the friction of taking the first step as consequential. If joining a plan requires an active choice, postponement can leave a worker outside it; if remaining in the plan is the default and opting out requires action, inertia can work in the opposite direction and keep that worker saving.

Defaults and future income

Automatic enrollment changes which action requires effort. Workers are enrolled unless they opt out, and they are significantly more likely to stay in a plan under this arrangement than when they must actively sign up. The policy therefore uses a feature of decision-making—people’s tendency to stick with the existing arrangement—to support a goal many already endorse.

The book also describes a related approach devised by economists Richard H. Thaler and Shlomo Benartzi. At one company, workers could choose different savings rates for current income and income they would receive in the future. They selected substantially higher rates for income months ahead than for income available now. Within a short time, their average savings rate had doubled. The contrast shows why an opportunity to commit future income may be more effective than asking people to surrender as much of their current pay.

A structure for collective benefit

The policy illustrates the book’s broader argument that institutional design can help people make choices with better long-term consequences. Instead of requiring everyone to save at a prescribed rate, automatic enrollment changes the frame in which the decision occurs: participation becomes the starting point, while opting out remains possible. The future-income option likewise lets workers adopt a higher savings rate without asking them to give up the same amount of current income immediately.

These approaches seek to harness people’s preferences rather than override them. The book argues that suitable structures can help more rational collective behavior emerge from individual decisions, while emphasizing that not every individual irrationality calls for a new structure. Identifying which patterns matter—and which institutional adjustments can address them—is part of the continuing task of behavioral economics.