Watch the full segment to see Colbert ask — and answer — hard questions like this one:
If Danny gives Johnny $10 to copy his homework, then the teacher gives Danny $50 for turning in his homework for an A, how much money does Danny have left to give Johnny for tomorrow’s homework?
The answer is: Danny has no idea, because it was his math homework.
Also worth noting: During his interview, Fryer doesn’t claim that paying kids for good grades is a sure bet. When Colbert asks if the program is working, Fryer says, “We don’t know yet.” And he says he’ll scale the experiment up to more cities next year — but only “if it works. … If it doesn’t, we’ll try the next innovation next year.”