Real people are rarely as coherent, forward-looking, strategic or selfish as typically assumed in standard economic models—they sometimes do not pursue their own interests, and can be unexpectedly generous. Such dynamics should be factored more carefully into development policies, a point made in the World Development Report 2015: Mind, Society, and Behavior.  The newly launched report argues that development policies based on new insights into how people actually think and make decisions will help governments and civil society more readily tackle such challenges as increasing productivity, breaking the cycle of poverty from one generation to the next, and acting on climate change. Drawing from a wealth of research that suggests ways of diagnosing and solving the psychological and social constraints to development, the WDR identifies new policy tools that complement standard economic instruments. For instance, an experiment in Colombia modified a cash transfer program by automatically saving a part of the funds on behalf of beneficiaries, and then disbursing them as lump a sum at the time when decisions about school enrollment for the next year were being made. This tweak in timing resulted in increased enrollments for the following year. “Marketers and politicians have long understood the role of psychology and social preferences in driving individual choice,” said Kaushik Basu, Senior Vice President and Chief Economist of the World Bank, “This Report distills new and growing scientific evidence on this broader understanding of human behavior so that it can be used to promote development. Standard economic policies are effective only after the right cognitive propensities and social norms are in place. As such, this WDR can play a major role in enhancing the power of economic policymaking, including standard fiscal and monetary policies. My only worry is that it will be read more diligently by private marketers selling wares and politicians running for office than by people designing development interventions.”