【单选题】【消耗次数：1】
下列说法中错误的是（）。
①
只要总产量减少，边际产量就为负数值
②
只要边际产量大于，总产量就会增加
③
只要总产量增加，平均产量就一定增加
④
只要平均产量增加，边际产量就大于平均产量
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