And, yet another lecture glitch: …_欧洲杯在线买球_欧洲杯投注网站推荐@

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2011-12-08T00:44:23.000Z
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And, yet another lecture glitch: In the problem set, problem 2 alternative II, part (a) was about calculating the elasticity of y wrt. x, not the derivative y' which I wrote down.

The elasticity is xy'/y, so you add another line to my exposition by multiplying that answer by x/y.

This error did not affect the calculations for part (b), the elasticity of substitution.