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True or false. The U shape of the long-run ATC curve is the result of diminishing returns.
In addition, it is not economic due to scale (operating in an upward-sloping region of the long-run mean cost curve) only if it experiences declining returns to scale, and therefore is therefore uneconomical. Also, economies of scale are not a factor if it earns constant returns on scale. If the firm does not have a superior rival in the market for inputs and has no economies of scale, these conclusions will be altered.
FALSE. Because:
It happens because of the dominance of average fixed cost (AFC), which causes the average total cost (ATC) to fall. After a while, though the average variable cost (AVC) becomes dominant and the average total cost (ATC) starts to increase.