[单选题] 提问人:匿名网友 提问时间:2021-08-24

Patents are granted in order to encourage firms to invest in the research and development of new products. Patents are an example of.


A .Market concentration.
B .Collusion.
C .Exclusionary practices.
D .Barriers to entry.

提问人:匿名网友 提问时间:2021-08-24

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