The Sale of By-Products of Public Goods Can Sometimes Help

Multiple Choice

The sale of by-products of public goods can sometimes help to finance those goods. Which of the following would not be a by-product of a public good?

A) Selling fishing license to fish off of a public bridge.
B) Charging a fee for GPS signals that come from a defense department satellite.
C) Adding software to a computer you are selling in hopes of getting more sales.
D) Having police contract with a newspaper to deliver papers on the morning patrols.