[問題] 經濟學差別取價問題
請教幾個疑問有關區間差別訂價跟市場差別訂價的區分
像是打電話分白天的費率跟晚上的費率不同是屬與市場差別訂價，那請教同時段但打越久越便宜是屬於區間嗎？
有時這兩個好難區分喔？是否有較好認定的方法嗎？
謝謝
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