In an open economy, suppose the IS curve can be written as: Y = C[Y]+ I[i] + G + T[Y, E] (1) The parameters have all the usual signs. Now suppose we want to condense this equation into the following...

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Extracted text: In an open economy, suppose the IS curve can be written as: Y = C[Y]+ I[i] + G + T[Y, E] (1) The parameters have all the usual signs. Now suppose we want to condense this equation into the following form: Y = D[I, G, E] (2) Using this condensed formulation dY/dE is DE. By totally differentiating equation #1, show that: DE= TE{1- CY, TY}