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雷达卡
Derive geometrically the Marshallian and Hicksian demand curve for X1 if price of
X2 increases. Assume X1 is a gross substitute as well as a net substitute for X2.
Show also the relationship mathematically.
我实在是搞不明白，X1的马歇尔和希克森需求曲线，到底是怎么画的。
求指点！
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