如果需求富有弹性，价格提高如何影响收益？
If demand is elastic, how will an increase in price change total revenue?
折弯的需求曲线是垄断厂商面对的在现行的价格下有一个折点的需求曲线，需求在价格上升时要比价格下降时更富有弹性。
The correct conclusion should be this:in the same demand curve, there can be different elasticity to different points, and the price elasticity can be one in the middl.
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