A four-year-old in a suburban daycare earns a sticker every time she shares a toy. By six, she shares less when no sticker is offered. The teachers notice but struggle to explain why. A German philosopher who never had children of his own predicted exactly this outcome in lectures delivered more than 200 years ago.
Immanuel Kant argued that children taught to be good only for rewards grow into adults who calculate personal advantage rather than follow moral principle. His observation cuts directly into a parenting culture that now runs on sticker charts, token apps, and behavior-tracking platforms projected to reach a $3.2 billion global market by 2028.
Kant’s reflection reads: “If you punish a child for being naughty, and reward him for being good, he will do right merely for the sake of the reward; and when he goes out into the world and finds that goodness is not always rewarded, nor wickedness always punished, he will grow into a man who only thinks about how he may get on in the world, and does right or wrong according as he finds advantage to himself.”
His concern was not about whether rewards work in the short term. He believed they work too well at producing compliance while failing to build genuine moral understanding. The question Kant raised is whether a generation raised on external incentives can develop the internal compass required when no one is watching.
What Kant Identified About Reward Systems
When a child receives a treat for sharing or loses screen time for hitting, the child learns to associate behavior with consequence. What the child does not necessarily learn, according to Kant, is why sharing matters or why hurting others is wrong beyond the personal cost.
He contended that this approach installs a transactional mindset. Moral choices become calculations. The question shifts from “What is the right thing to do?” to “What will happen to me if I do this?” Kant saw this as a fragile foundation.
Children raised inside a reliable system of rewards and penalties eventually step into a world that offers no such consistency. Good deeds go unnoticed. Bad actors prosper. When that happens, the reward-trained adult loses the only reason they had for behaving ethically. The framework, built entirely on external scaffolding, collapses.
Kant’s alternative rested on what he called duty. An action possesses moral worth only when performed because it is right, not because it brings pleasure, avoids pain, or secures some benefit. The intention behind the act, not its outcome, determines its ethical quality.
The Research That Supports Kant’s Concern
Modern psychology has produced evidence Kant could not have anticipated. In a foundational 1973 study published in the Journal of Personality and Social Psychology, researchers Mark Lepper, David Greene, and Richard Nisbett demonstrated that expected rewards undermine intrinsic motivation. Children promised a reward for drawing later spent half as much time drawing during free play compared to peers who received no reward or an unexpected one. The external incentive had drained the activity of its intrinsic motivation.
Edward Deci and Richard Ryan of the University of Rochester extended this work across decades. In a comprehensive 1999 meta-analysis published in Psychological Bulletin, Deci, Ryan, and Richard Koestner examined 128 studies and confirmed that tangible rewards significantly reduce free-choice intrinsic motivation. The effect was strongest in children.
They later published an additional analysis in the Review of Educational Research, directly addressing critics and reaffirming that the undermining effect carries real consequences for educational practice. The conclusion was unambiguous: rewards get compliance. They do not get commitment. A child who returns a lost wallet because a parent promised ice cream has not practiced honesty. The child has practiced transaction-evaluation. Remove the ice cream, remove the behavior.
Kant’s Answer and Its Cost
Kant did not merely diagnose the problem. He proposed a demanding solution. The moral law must be self-imposed. He formulated the categorical imperative, the principle that one should act only according to rules that could become universal laws. This requires a person to ask not what they will gain but whether they would want everyone to act the same way.
His central ethical work, the Groundwork of the Metaphysics of Morals, published in 1785, argues that a rational being recognizes moral obligation through reason alone. No external authority, no promised heaven, no threatened hell, no gold star. The moral worth of an action lies entirely in the motive.
This is a high bar. In his lectures on pedagogy at the University of Königsberg, Kant admitted that very young children cannot grasp abstract moral concepts. But he insisted that the direction of moral education must point toward duty from the start, even if the child cannot yet articulate why. The goal is character that stands upright without external propping.
Where Parents and Educators Break With Kant
Developmental psychologist William Damon, former director of the Stanford Center on Adolescence, has pushed back on Kant’s absolutism. In his 1988 book The Moral Child, Damon argued that moral growth follows a developmental sequence and that children need respectful engagement rather than either rigid conditioning or abstract philosophizing. He wrote that “no amount of rote learning or indoctrination will prepare children for the many diverse situations that they will face in life.”
Dr. Becky Kennedy, a clinical psychologist whose parenting platform Good Inside reaches millions of followers, represents a different departure. After practicing a reward-and-punishment model early in her career, she found those methods “feel awful for kids and parents” and developed an approach grounded in attachment, mindfulness, and emotion regulation instead. Her model shares Kant’s distrust of reward economies while acknowledging that parents operate in real kitchens with real tantrums, not philosophy seminars.
The tension is practical, not merely academic. A parent using a behavior-tracking app to manage a child’s morning routine is participating in a system Kant would condemn. That same parent may also be a working single mother with no bandwidth for Socratic dialogue at 7 a.m. The philosophical critique lands; the practical alternative often does not.
