第18章 学海无涯,独孤求败

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 数学老师听到了自己想要的答案,满脸得意。
    他刚要凭借资历训斥端木希几句,却没想到后者目光扫向他的拉丁文板书,在众人惊讶的眼神下开口:
    “不过,老师您写的专有名词拉丁文写错了。”
    “您写的‘效用最大化’,应该是‘MaximatioUtilitatis’,而不是‘Utilitatum’,这里属于词格错误。”
    “我上的是数学课,不是拉丁文课。”数学老师面色阴沉,“端木希同学,请不要在与课堂无关的知识点上卖弄你的学识。”
    这句话本意是讽刺端木希显眼包,落到同学们的耳朵里竟生出了第二层意思——
    想要卖弄学识,得先有学识。像有些人被点名叫起来,支支吾吾什么有用的话都没说出来,想要卖弄学识都没有门路。
    叶逸欢又将这道题粗略地看了一遍,认真道:
    “这道题的关键其实是根据效用函数和预算线的交点,找到消费者在给定预算下的最优选择,所求的就是那个最大化效用的点。如果把拉丁文用对,可能会更好理解。”
    数学老师的脸色变了变,深吸一口气,却说不出反驳的话。
    “你们两个,都坐下吧。”
    端木循仿若被释放的囚徒,坐回座位上,长舒一口气。
    她看着自己的姐姐安然落座,好像没事人一样,心底顿时生出一股复杂的情绪。
    “你就算知道得比我多又怎么样?”
    端木循不甘地咬了咬牙,狠狠地瞪向端木希,低声嘀咕,
    “你想以此来提醒我,你比我更出色?你不过是有点小聪明罢了,想要证明你比我更有能力管理端木家?别做梦了!”
    “再说,这儿没人学过拉丁语,就算你胡编乱造,也没人瞧得出来。说到底,你要是会解这题目,也不用靠花言巧语糊弄过去了!”
    不论端木希的出发点是怎样的,她终究帮端木循解了围,这让后者心中萌生出了莫名的不爽。
    没想到,过了片刻,端木希处传来一张纸条。
    端木循打开一看,上面赫然写着:
    “市场的整体利润可以表示为两家公司利润的总和,即P(x,x)=P(x,x)+P(x,x),为了最大化整体市场的利润,需要对x和x分别求偏导数,并令其为零,即P/x=P/x+P/x=0,P/x=P/x+P/x=0。”
    “而纳什均衡的条件可以用x*=argmaxP(x,x*),x*=argmaxP(x*,x)表示,其中x*和x*就是题目中要找的纳什均衡点,也就是两家公司都无法通过单方面改变自己的定价来提高利润时的价格组合。”
    端木循:“......”
    她突然觉得,自己可能晕字。
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