在需求弹性不变的情况下，边际收益是多少？

2 (Exercise) For the case of constant elasticity of demand, what is marginal revenue?

youdao

艺电重申，其对2012财年每股收益的预期保持不变，为70-90美分，全年的营收预期则从原来的38亿美元调高至40.25亿美元，华尔街给出的数字是39亿美元。

The company affirmed its previous FY 2012 forecast for non-GAAP profits of 70-90 cents a share, and now expects revenue of $3.8 billion to $4.025 billion. Street consensus is for $3.9 billion.

youdao

收益也不是一成不变的 ：对于易腐烂商品来说，买一送一或买二送一的交易没有听装食品来着实惠。

The benefits vary: BOGOF or three-for-the-price-of-two deals are less valuable for perishable foods than for tinned goods.

youdao

So here are their payoffs and once again the basic structure of the game hasn't changed.

这就是他们的收益,这次博弈的基本结构还是不变

耶鲁公开课 - 博弈论课程节选