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Behavioural Nudges in Public Policy: Translating Theory into Practice
The Nudge Theory is a concept developed by behavioural economist Richard Thaler and legal scholar Cass Sunstein. In behavioural economics, a nudge subtly alters the environment or context in which people make decisions with the aim of influencing their choices or behaviour. The guiding philosophical framework behind the Nudge Theory is “Libertarian Paternalism”, coined by Thaler and Sunstein in 2003. Libertarianism protects the freedom to choose, while paternalism tries to guide one towards safer and healthier decisions. Behavioural nudges are designed to guide decisions in predictable ways by leveraging cognitive biases without restricting freedom of choice. Nudges usually appeal to our System 1 brain, the mode of thinking that provides us with automatic, unconscious, and emotional responses to stimuli. Practitioners use libertarian paternalism by acting as ‘choice architects’– those who design the physical or digital environments where decisions are made. Choices are arranged in such a way that the beneficial option becomes the easiest one. Most interestingly, it relies on human habits– heuristics, cognitive bias, bounded rationality, default option– to steer behaviour without argument.
Traditional policy approaches often assume that individuals respond predictably to information, prices, and incentives. In practice, however, decisions are made differently. This approach, therefore, involves designing policies and programmes around real-world patterns of behaviour, rather than around idealised assumptions of rational decision-making. Applications of behavioural economics have emerged as a powerful tool in addressing complex social challenges through evidence-based interventions. The World Development Report 2015: Mind, Society, and Behaviour provides an important framework for this very approach, highlighting that people “think automatically,” “think socially,” and “think with mental models.” These insights suggest that effective policy can go beyond regulations and incentives to also consider how people perceive choices, respond to social expectations, and understand the world around them.
In contemporary public policy practice, nudging is gaining significant momentum, especially as governments and organisations confront complex challenges like promoting environmental sustainability, social empowerment, improving public health outcomes, and encouraging community hygiene and sanitation. The power of using nudges to increase social outcomes and decision-making makes it a vital instrument for modern policymaking.
This very phenomenon is exemplified by the work done by organisations like Project Mumbai, NammaKasa, and ThinkZone. These organisations are doing pioneering work in adopting innovative nudges and choice architecture to influence citizens’ behaviour in more positive ways to bring about social change.
Project Mumbai is a Public-Private-People partnership with the goal of ensuring social transformation. Their most prominent use of nudge principles lies in their Plastic Recyclothon. It is a citizen-led initiative where people can donate their plastic waste. It uses simple behavioural nudges by increasing convenience of waste pick-ups and drop-offs, creating habit loops of recycling, and most importantly, providing visible feedback of the initiative by transforming collected plastic into benches, bins, and other amenities for the community. Project Mumbai relies on friction reduction (choice architecture) through free doorstep pickup of the waste, visible feedback loops by turning the donated plastic waste into physically labelled benches, social proof at scale by publicising participation numbers– a very robust nudge lever, and habit anchoring by timing the drive to DaanUtsav, therefore attaching the new behaviour to an existing ritual.
NammaKasa is a citizen-first, AI-driven civic tech platform built to tackle the persistent garbage and waste management crisis in Bangalore, India. The app is designed to bypass slow-moving government complaint portals. NammaKasa addresses the psychological phenomenon where people normalise poor civic conditions because ‘nobody can see who is responsible’. The main behavioural nudges can therefore be brought down to: eliminating friction by making reporting cheap and low-effort which drives up participation, correcting diffusion of responsibility to counter the bystander-effect-style bias, having social proof and public leaderboards so that seeing pertinent issues mapped collectively counteracts the feeling of isolation, gamification of the platform which flips an otherwise frustrating chore into an engaging, collective effort, and salience correction– their photo-based reporting feature forces re-noticing, interrupting the habituation bias.
ThinkZone is an India-based non-profit organisation that helps parents and educators support the development of children’s foundational skills by integrating technology enabled programs into government systems. The Parents’ Remote Assistance and Knowledge Support for Holistic Advancement of Kids or PRAKASHAK is a flagship initiative that integrates structured parental engagement into the public school system in collaboration with the government of Odisha. The program uses guided behavioural nudges and a social recognition system such as identifying champion parents, awarding digital certificates, and celebrating active participation at the school level. The nudge mechanisms in this initiative therefore work around bounded rationality and choice overload by providing bite-sized, few-minutes-a-day micro activities that parents can engage in, reframing by looking at teaching as something parents implicitly do by designing activities around household objects, social recognition and identity-based motivation by identifying ‘champion’ parents, and habit loop reinforcement to sustain engagement past the initial novelty phase.
These examples demonstrate how nudge theory is increasingly influencing public policy by shifting the focus to understanding how people actually make decisions and participate in public programmes. They redesign the choice environment by reducing friction, making desirable behaviours more convenient, providing visible feedback, using social recognition, and creating opportunities for repeated engagement. Project Mumbai makes responsible waste disposal tangible by showing citizens how their plastic is transformed into community assets; NammaKasa uses visibility, transparency, and gamification to encourage civic participation; and ThinkZone uses small, accessible activities and social recognition to build parents’ confidence and engagement in their children’s learning.
In conclusion, we see how behavioural insights can complement traditional public policy tools, making programmes more responsive to the realities, motivations, and constraints of citizens, and ultimately help translate policy objectives into sustained everyday behaviours.