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Please give me Answer fastly Please prove that in the Krugman (1979) model, after opening trade, consumer welfare has improved. Please use mathematical model to

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Please give me Answer fastly

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Please prove that in the Krugman (1979) model, after opening trade, consumer welfare has improved. Please use mathematical model to prove. ( hint: envelope theorem can be used in proving optimization problem of utility) Formulas must be used. like: N = 1/ (a/L + BC)

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