Problem
a. What are the three sources of the barriers to entry that allow a monopoly to remain the sole seller of a product?
b. What is the entry barrier that is the source of the monopoly power for the following products or producers? List some competitors that keep these products or producers from having absolute monopoly power.
(1) United States Postal Service
(2) Perrier Spring Water
(3) Prozac (a brand-name drug)
(4) DeBeers Diamonds
(5) Principles of Economics by N. Gregory Mankiw (your textbook)
(6) Edison Power Company
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.