An industry is considered to have constant costs if the entry or exit of firms has no impact on resource prices.
An industry is considered to have constant costs if input costs do not alter in response to variations in industrial output. One explanation is that just a small percentage of the total demand for input resources is met by the industry. Constant costs also exist when a rise in demand has no impact on the price of manufacturing.
In this sector, supply growth keeps pace with early demand growth. As a result, over time, prices eventually return to their initial levels. Because each company's cost curve is unaffected by changes in industrial output, the long-run supply curve is horizontal (perfect elastic).
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