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For a Cobb-Douglas utility functionu(X, Y) =13ln (X) +23ln (Y),XandYare(a)gross complements(b)gross substitutes(c)neither gross complements nor gross...

For a Cobb-Douglas utility functionu(X, Y) =13ln (X) +23ln (Y),XandYare(a)gross complements(b)gross substitutes(c)neither gross complements nor gross substitutes(d)cannot say without further information

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