Samia has decided that with the two hours in between classes she can do one of 3 things. She has ranked her choices, from highest to lowest as, (1) chat with her friends, (2) study economics or (3) take a nap. The opportunity cost of chatting with her friends is:
if she chats with her friends her enjoyment and overall mood will increase. However she will lose the chance to study economics and her grade will most likely be lower