【单选题】【消耗次数：1】
一国拥有的劳动力充裕，故它应专门生产劳动密集型产品对外进行交换，这种说法来自（ ）。
①
李嘉图的比较成本说
②
亚当，斯密的绝对成本说
③
赫克歇尔和俄林的要素禀赋学说
④
凯恩斯的贸易差额说
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