ตอบคุณ Scylla_Shadow
1. (คือหน่วยเพิ่มชิ้นท้ายสุด ให้ผลตอบแทนมากกว่าต้นทุน) อ่านในวงเล็บไม่รู้เรื่อง เข้าใจว่า ถ้าผลิตสินค้าเพิ่มอีกหนึ่งหน่วย จะทำให้มีกำไรมากขึ้น
หน่วยเพิ่มชิ้นท้ายสุด คือ Marginal Product ครับ
In economics and in particular neoclassical economics, the marginal product or marginal physical product of an input (factor of production) is the change in output resulting from employing one more unit of a particular input (for instance, the change in output when a firm's labor is increased from five to six units), assuming that the quantities of other inputs are kept constant.
marginal revenue is the additional revenue that will be generated by increasing product sales by one unit. It can also be described as the unit revenue the last item sold has generated for the firm.
marginal cost is the change in the total cost that arises when the quantity produced is incremented by one unit, that is, it is the cost of producing one more unit of a good. In general terms, marginal cost at each level of production includes any additional costs required to produce the next unit.
Wikipedia
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