Patents and Copyrights Provide Some Degree of Market Power to Holders

Patents and copyrights provide some degree of market power to holders because

A) patent holders often share their knowledge with others.
B) firms can often evade patents and copyrights by making slight changes in design.
C) patent holders are protected from direct competition in the short run.
D) very few patents are granted each year.
E) there is no penalty in duplicating the patented products at low cost.