Problem
Nicolas has purchased a streaming audio service for $8.00 per month. As he listens to more songs in a month he spread this fixed cost over a larger number of songs, and therefore his cost per song decreases the more songs he listens to. One if his friends say to Nicolas: "The more music you listen to, the less you pay per song so you should spend all your time listening to music." Explain what is wrong with the friend's statement.