Is Extrinsic Motivation a Good Idea?

When I was writing my first book, I tried to get my ad round all the literature on rewards and extrinsic and it's a flipping nightmare market. So one of the things I picked up on is that sometimes you perhaps need a bit of extrinsic motivation to kind of kickstart this kind of virtuous cycle where you then put a bit more effort in. And whilst there may be some short term boost out of setting targets for students, those kind of performance goals don't help them in the long run.