Would love to see a similar study done with students. Maybe there has been. I think the incentives while working might not work because people are already getting paid, or don't actually want the incentive. Students are much poorer, really like spending money and spending an extra hour studying is less of a hurdle perhaps.

Scholarships show that students definitely work harder if they have the pressure of losing a scholarship if they do not work hard enough.

It's an interesting thing to think about. I do wonder what would happen if this was actually a thing we would create and it became a success.