For u=x11/2x21/2u = x_1^{1/2} x_2^{1/2}u=x11/2x21/2: Hva er MRS?
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u1′=(1/2)x1−1/2x21/2u'_1 = (1/2) x_1^{-1/2} x_2^{1/2}u1′=(1/2)x1−1/2x21/2, u2′=(1/2)x11/2x2−1/2u'_2 = (1/2) x_1^{1/2} x_2^{-1/2}u2′=(1/2)x11/2x2−1/2. MRS = u1′/u2′=x2/x1u'_1/u'_2 = x_2/x_1u1′/u2′=x2/x1. I optimum: x2/x1=p1/p2x_2/x_1 = p_1/p_2x2/x1=p1/p2.
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