Extensive Reading #4

The most interesting fact which I read on the class is that incentive makes a reverse effect.
In this chapter, In order to reduce the number of parents who are late to pick up their child at the day care center, the economists set up the fine, but the number of them was increased conversely as a result. 
The reason why I was interested in this fact is that I had ever thought that the incentive always makes issues improved. Therefore, I was surprised at this fact, and I was attracted to why such a phenomenon happens.