➤ How is the utility function written for perfect complements and what does it imply?
Use a Leontief utility like u(x,y)=min(x/α,y/β). This enforces a fixed consumption ratio α:β: extra units of one good add no utility unless the other increases the matching amount. Indifference curves are right-angle kinks, showing perfect complementarity and no willingness to trade one good for another except in fixed proportions.
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