Concrete is one of the most used building materials in the world. Ready-mix concrete is sold by volume. Suppose the quantity demanded per month for concrete is 1,200 at the price of $300 per unit. The following table shows the costs of a monopolist producing concrete:

Briefly explain if this firm has a natural monopoly.

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Quantity (per Month) 800 1,000 1,200 1,400 Total Cost $112,000 130,000 144,000 154,000