You go to your campus bookstore and see a coffee mug emblazoned with your university's shield. It costs $5 and you value it at $8, so you buy it.

You go to your campus bookstore and see a coffee mug emblazoned with your university's shield. It costs $5 and you value it at $8, so you buy it. On the way to your car, you drop it and it breaks into pieces. Should you buy another one or should you go home because the total expenditure of$10 now exceeds the value that you