This grant supports a consensus study by the National Academies of Sciences, Engineering and Medicine (NASEM) on the evolution of behavioral economics on the occasion of the 40th anniversary of the field. Overseen by an independent committee of 15 experts from diverse fields—including economics, psychology, and cognitive science—the report will draw on a wide range of perspectives to synthesize four decades of research, catalog the field’s increasing relevance to policymaking, celebrate the work of seminal researchers, raise unaddressed challenges, and identify promising avenues for future study. The final report, tentatively titled Assessing Behavioral Economics at Age 40: A Consensus Study, will be widely disseminated and available to academics and the public alike.