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.