In the Princess’s class, there is an elaborate system of incentives. Good behaviour earns you a ticket; eight tickets get you a free homework pass. Herself decided that she would earn and save up homework passes so she could use them to get off homework every night for the last fortnight of school. Initially, her plan worked perfectly but then last Wednesday with 8 nights of homework to come, the teacher announced that there is to be no homework for the rest of the year.
I am not quite sure what the moral is; possibly, don’t trust the system it will betray you.