已知有三个goods, x1 x2 x3，现在知道consumer的preference满足local non-satiation。然后知道x1的budget share是0.4，x1的expenditure elasticity 是1.8，x2的expenditure elasticity是0.4。又知道marshallian price elasticity of good x1 对于price of good x2是 0.6，marshallian price elasticity of good x2 对于 price of good x1 是 0.8。求解marshallian price elasticity of good x3 对于price of good x2，marshallian price elasticity of good x2 对于price of good x3，和x2自己的marshallian price elasticity。
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