关于马歇尔勒纳条件的推导

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以下推导过程是维基百科上的，没看懂，请指导一下

Here 'e' is defined as the price of one unit of foreign currency in terms of the domestic currency.
Using this definition, the trade balance denominated in domestic currency, with domestic and foreign prices normalized to one, is given by:
Nx = X − Qe
where X denotes exports, and Q imports.
Differentiating with respect to e gives:

Dividing through by X:

At equilibrium, X = eQ. Therefore:

Multiplying through by e:

Which can be expressed as
where ηXe and ηQe are common notation for the elasticity of exports and imports with respect to the exchange rate respectively.
In order for a fall in the relative value of a country's currency (i.e. a rise in e using the above definition) to have a positive effect on that country's trade balance, the left hand side of the equation must be positive (i.e. for a rise in e to cause a rise in Nx)
Therefore:
0 
\Rightarrow \eta_{Xe} - \eta_{Qe} > 1 " src="http://upload.wikimedia.org/math/d/5/8/d58914bf58dbcd7859d4ccd0ebdf7ab6.png">
Which can be written as:
1 " src="http://upload.wikimedia.org/math/8/3/0/830884b6bf30ca4a1361ec692e2242e7.png">

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关键词：马歇尔勒纳条件 马歇尔勒纳 尔勒纳 马歇尔 respectively 推导 条件 马歇尔勒纳

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kankanxian

马歇尔勒纳条件讨论的是贬值对国际贸易改善所起的作用，就是所谓的弹性论。
假设：1进出口商品的弹性无穷大，即供给曲线水平。
         2收入、其他商品价格、消费者偏好等其他条件不变
         3以供给方货币及计价。即进口以外币计价，出口以本币计价。B国际贸易差额X出口M进口P、P*价格e汇率
        B=XP-MP*e   对此式求导得：
       dB/de=p*m(ExXP/MP*e+Em-1)>1因为市场出清，所以XP=MP*e，所以Ex+Em>1
希望这种解法你能看懂。