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The law of diminishing returns is an economic principle which will inevitably affect firms in the short run, whereas it is not always possible for firms to achieve economies of scale. Explain how a firm's costs of production are affected by the law of diminishing returns in the short run and how they may be affected by economies of scale in the long run.[15 marks]

Could you please provide a B+ answer so i can see how to answer a question like this . thanks.