Incentives
Janie and her friends really wanted to buy tickets to a band concert. They added all their money up together and they did not have enough to buy everyone a ticket to the concert but they did have enough to pay for tickets to the amusement park. Janie and her friends decided to go their instead. What was the opportunity cost?
The opportunity cost was the amusement park.
Miss Wright was trying to make her famous chocolate cake with her famous chocolate buttercream frosting. She needed to have about a cup of cocoa powder in total for the cake and frosting but she only had a half of cup. What economic problem did Miss Wright have?
Scarcity!