單項(xiàng)選擇題長期平均成本曲線呈U型,是因?yàn)椋ǎ?/strong>

A.邊際收益遞減規(guī)律
B.生產(chǎn)由規(guī)模經(jīng)濟(jì)到規(guī)模不經(jīng)濟(jì)
C.邊際技術(shù)替代率遞減規(guī)律
D.邊際效用遞減規(guī)律


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