Patents are granted in order to encourage firms to invest in the research and development of new products. Patents are an example of:
a.Barriers to entry.
b.Collusion.
c.Exclusionary practices.
d.Market concentration.
答案：A
Explanation
Choice "a" is correct. Patents are an example of barriers to entry. Patents prevent other rival firms (without patents) from entering the market and consequently, are a form of barriers to entry. Patents can be "process-related" or "product-related."
Choices "d", "c", and "b" are incorrect, per above explanation.
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