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The production function is concave with decreasing returns.
生产函数是凹性的，边际报酬递减。
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Result shows that corn production in main producing areas is mainly scale inefficiency and is at the stage of decreasing returns to scale.
主产区玉米生产全要素生产率提高主要是由于技术进步速度大于技术效率下降的速度。
Mr Blodget worries that Amazon spends more to generate revenues than he ever thought possible: whatever Mr Bezos says about synergies, Amazon seems to be facing decreasing returns to scale.
ECONOMIST: Electronic commerce
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