A barrier to entry that significantly contributes to the establishment of a monopoly would be:

Question

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Patents provide legal exclusivity to the inventor to produce and sell a particular product or use a particular process for a limited period of time. This barrier to entry prevents competitors from entering the market and selling a similar product or using the same process, allowing the patent holder to establish a monopoly.

Answer: D 
 Diseconomies of scale occur when a firm becomes too large and its production costs increase due to factors like coordination problems, communication breakdowns, and bureaucratic inefficiencies. These increased costs make it difficult for new firms to enter the market and become competitive with established monopolies that have already achieved economies of scale.

A Barrier to Entry That Significantly Contributes to the Establishment