The theory changed as economists realized conditions in the market were imperfect, and that only a small number of companies in certain industries, such as autos, had economies of scale.
理论变化是因为经济学家了解到市场的条件是不完美的，何况只有一小部分公司在一定的行业规模化了。
The theory changed as economists realized conditions in the market were imperfect, and that only a small number of companies in certain industries, such as autos, had economies of scale.
理论变化是因为经济学家了解到市场的条件是不完美的，何况只有一小部分公司在一定的行业规模化了。
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