A. It is natural monopoly, a type of monopoly that exists due to strong economies of scale over long-range of output. The major barrier to entry is natural barriers to entry as a firm needs the high start-up costs for conducting such a business in a specific industry. So it needs to make initially large average total costs.
B. it may be often due to specific raw material requirement, technology requirement that makes natural barriers to enter the new firm. Patent over a product is a general example that requires huge initial cost so it makes that firm to achieve economies of scale over long time. if a firm develops an efficient production process that is unique enable it to enjoy falling average total costs. Hence technological advantage or huge initial cost like in rail transport enable a firm to to enjoy falling average total costs.
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