The Influence of Rewards on Moral Development
A four-year-old in a suburban daycare earns a sticker every time she shares a toy. By age six, she shares less when no sticker is offered. Teachers notice the shift but struggle to explain why. A German philosopher who never raised children of his own predicted exactly this outcome in university lectures delivered more than two centuries 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. He did not question whether rewards work. He argued they work too well at producing compliance, and that this is precisely the problem.
Kant’s core warning, preserved in his collected lectures and writings, is blunt: “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.”
The final clause matters most. A child raised on transaction does not become immoral. He becomes a calculator. Kant saw this not as a failure of discipline but as a failure of moral education. The behavior was never internalized. It was only rented.
What Kant Identified About Reward Systems
When a child receives a treat for sharing or loses screen time for hitting, the child learns to connect behavior with consequence. What the child does not learn, according to Kant, is why sharing matters or why hurting others is wrong beyond the personal cost.
He believed this approach installs a transactional mindset. The question shifts from “What is the right thing to do?” to “What will happen to me if I do this?” That shift is subtle in a well-behaved six-year-old. It becomes visible only later, when the rewards stop and the behavior collapses.
Kant’s Alternative Rested on Duty
Kant’s alternative rested on what he called duty. An action carries moral worth only when performed because it is right, not because it brings pleasure, avoids pain, or secures a benefit. In his Groundwork of the Metaphysics of Morals, published in 1785 and available as a free ebook through Project Gutenberg, he argued that a rational being recognizes moral obligation through reason alone. No gold star. No threatened punishment. The moral worth of an action lies entirely in the motive.
The Research Kant Could Not Have Run
Modern psychology confirmed a mechanism Kant identified without access to controlled experiments.
In a 1973 study published in the Journal of Personality and Social Psychology, researchers Mark Lepper, David Greene, and Richard Nisbett divided preschool children into three groups. One group was told they would receive a reward for drawing. A second group received an unexpected reward after drawing. A third group received no reward at all. During free play later, the group promised a reward spent half as much time drawing as the other two groups.
The finding was not that rewards reduce motivation. The finding was that expected rewards undermine intrinsic motivation. Children who drew for its own sake kept drawing. Children who drew for a promised payoff stopped once the payoff was removed. The behavior had been trained, not chosen.
Edward Deci and Richard Ryan’s Contributions
Edward Deci and Richard Ryan of the University of Rochester spent decades extending this work. In a 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. The conclusion was not that rewards are useless. It was that rewards produce compliance, not commitment. A child who returns a lost wallet because a parent promised ice cream has not practiced honesty. The child has practiced calculating whether the ice cream is worth the wallet.
The Demanding Alternative Kant Proposed
Kant did not offer parents an easier method. He offered a harder standard. Moral law, he argued, must be self-imposed. He formulated the categorical imperative, the principle that one should act only according to rules that could become universal laws. A person must ask not what they stand to gain but whether they would want everyone to act the same way.
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 say why. The goal is character that stands upright without external propping.
Where Kant’s Philosophy Meets Modern Parenting
This is where Kant’s philosophy collides with a kitchen at 7 a.m. A parent using a behavior-tracking app to manage a morning routine is participating in a system Kant would condemn. That same parent may have no bandwidth for moral reasoning before breakfast. The philosophical critique is clear. The practical alternative is not.
Where Modern Parenting Experts Depart From Kant
Developmental psychologist William Damon, former director of the Stanford Center on Adolescence, rejected Kant’s absolutism. In his 1988 book The Moral Child, Damon argued that moral growth follows a developmental sequence. Children need respectful engagement suited to where they are, not 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.” Damon’s concern is that Kant’s solution demands a cognitive capacity children do not yet have and a parental consistency most adults cannot sustain.
Dr. Becky Kennedy, a clinical psychologist and founder of the parenting platform Good Inside, arrived at a similar conclusion from clinical practice. She began her career using reward-and-punishment models and found they “feel awful for kids and parents.” Her alternative draws on attachment theory, mindfulness, emotion regulation, and internal family systems theory.
Kennedy’s framework shares Kant’s distrust of transactional parenting but replaces the abstraction of duty with connection and sturdy leadership. Where Kant would ask a child to reason toward universal law, Kennedy would ask a parent to see the child behind the behavior.
Her model does not claim to solve Kant’s problem. It claims to make the problem survivable in a real home. Kennedy launched Good Inside with colleague Erica Belsky in 2020, and the platform now translates complex psychological concepts into actionable strategies for parents who are not philosophers and children who are not small rational agents.
The tension between Kant’s ideal and the evidence from developmental science is not unresolved because researchers are still debating. It is unresolved because the two goals, building internal moral compasses and getting children through a Tuesday, are not the same project. Rewards produce short-term compliance at a cost. Kant’s alternative demands a maturity that develops slowly, unevenly, and not on schedule. The research confirms what Kant suspected. It does not make his solution easier to implement.
