The correct statement is:
"Diseconomies of scale can occur because of the difficulties in managing large enterprises as they increase in size."
Here's a brief explanation of why the other statements are incorrect:
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Diseconomies of scale will occur when a company experiences improved efficiency from managing large enterprises as they increase in size. - This statement is incorrect because improved efficiency relates to economies of scale, not diseconomies of scale.
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When economies of scale are all found within the individual firm, they are considered external economies of scale. - This statement is also incorrect. Economies of scale that occur within a firm are referred to as internal economies of scale; external economies of scale arise from factors outside of the firm that benefit all firms in a particular industry.
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A J-shaped long-run average cost curve occurs when there are first economies of scale over the initial range of output and diseconomies of scale as output increases. - While the description is somewhat accurate concerning economies and diseconomies of scale, the term "J-shaped long-run average cost curve" is not standard; typically, an average cost curve might show a U-shape rather than a J-shape due to the initial decrease in costs followed by an increase.