Read Eye on Song Downloads and Streaming. In 2018, Americans downloaded 400 million singles at $1.20 each and 50 million albums at $10 each. They also bought 52 million albums on CDs at $13 each and 50 million streaming subscriptions at $94 each. What does marginal utility theory tell you about the marginal utility of a single, an album download, an album on a CD, a streaming subscription, and a song streamed?