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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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