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Some factors that contribute to a firm achieving increasing returns to scale (or economies of scale) in the long run include:
What are size of the firm, opportunities for specialization, and the spreading effect. Larger firms have more opportunities to specialize both labor and capital to certain tasks. A worker, if allowed to specialize in a task, gets more skilled at performing that task as he or she produces more units of output. More skill translates to fewer mistakes and lower average cost. Other factors include spreading a very large initial setup cost over many units of output, managerial, accounting, and other organizational economies, and network externalities.