If a firm's marginal costs fall, then its price falls.
This is based on the principle that if the marginal cost of a product or firm rises, that implies that the firm is operating at a high fixed cost, thereby leading to an increase in the cost of production, which generally equates to products having a high price.
On the other hand, where there is low marginal cost, production costs reduce because the products are being produced at a lower fixed cost. Thereby leading to lower prices.
Hence, in this case, it is concluded that "If a firm's marginal costs fall, then its price falls."
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