| http://www.w3.org/ns/prov#value | - mizes profits by producing a quantity for which marginal revenue equals marginal cost. ??? ??? ??? A patent or copyright is a barrier to entry based on government action to protect a producer. ??? ??? ??? For which of the following firms is patent protection of vital importance? pharmaceutical firms ??? ??? ??? The De Beers Company, one of the longest-lived monopolies, is facing increasing competi
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