Heidelberg | Harvard Cooperation Report on lecture: “Nudging: Past, Present, Future”
As part of the strategic partnership between Heidelberg University and Harvard University, Professor Cass R. Sunstein (Harvard Law School), one of the world’s leading legal scholars and a pioneer of behavioral economics, delivered a guest lecture entitled Nudging: Past, Present and Future. The lecture traced the development of the concept of nudging and explored its significance for contemporary regulation and public policy.
Sunstein began by revisiting the classic definition of a nudge as an intervention in the choice architecture that predictably alters people’s behavior without forbidding options or significantly changing their economic incentives. Crucially, a nudge must remain easy and inexpensive to avoid. Drawing on familiar examples such as automatic enrollment in retirement savings plans, he illustrated how subtle modifications of the decision environment can produce substantial behavioral effects while preserving individual freedom of choice.
A central focus of the lecture was the ethics of nudging. Sunstein argued that choice architecture is unavoidable, as every environment in which decisions are made inevitably shapes behavior. The relevant question, therefore, is not whether to nudge but how and for what purpose. In line with his concept of libertarian paternalism, he maintained that nudges are justified when they are transparent, preserve freedom of choice through an easy opt-out, and help individuals make decisions that are “as judged by themselves.” He further rejected the common criticism that nudging is inherently manipulative or paternalistic, emphasizing that its legitimacy depends on its concrete design, democratic accountability, and the pursuit of legitimate public objectives.
In the final part of the lecture, Sunstein turned to the concept of “sludge,” by which he refers to excessive or unjustified frictions, such as burdensome paperwork, lengthy waiting times, or unnecessarily complex administrative procedures, that impede individuals from achieving their goals. He advocated the use of regular “sludge audits” to identify and eliminate avoidable barriers within both public and private institutions. Reducing sludge, he argued, not only improves administrative efficiency but also facilitates access to education, social benefits, and other public services, particularly for vulnerable groups. Most importantly, eliminating unnecessary frictions returns what he described as people’s most valuable resource: time.
Overall, the lecture demonstrated that behavioral insights have become an integral component of modern governance. Sunstein presented nudging not as a substitute for traditional regulation but as a complementary tool that combines effective policymaking with respect for individual autonomy. At the same time, his emphasis on reducing sludge underscored that improving public administration often requires not more intervention, but the removal of unnecessary obstacles.
