1. Classify the following services for computer owners with an Internet connection as rival or nonrival and as excludable or nonexcludable:

• eBay

• A mouse

• A Twitter page

• MyEconLab Web site 

2. Classify each of the following items as a public good, a private good, a natural monopoly good, or a common resource:

• Fire protection

• A seat at the final match of the U.S. Open (tennis)

• A pay-per-view movie on television

• The Ohio River