Today you are planning to see a motion picture, and you can attend either of two theaters. You have only a small budget for entertainment so prices are important. You have attended both theaters recently. One charged $5 for admission; the other charged $7. You habitually buy popcorn in the theater—each theater charges $3. The motion pictures now being shown are equally attractive to you, but you are virtually certain that you will never see the picture that you reject today. Identify the relevant costs. Explain your answer.