期刊名称：Discussion Papers in Economics / Manchester Metropolitan University
出版年度：2005
卷号：2005
出版社：Manchester Metropolitan University
摘要：By definition, to compare alternative long run equilibria is to compare
alternative points on the real input price frontier. It follows at once that one can never
move between long run equilibria by changing just one input price; one must change
at least two. And in some cases, indeed, such as the Wicksellian one, to change one
price is ipso facto to change all the others in a determinate manner. Hence the Hessian
of the cost function can – quite obviously – never represent the long run comparative
statics of input price-input quantity relations with accuracy. More detailed
investigation in fact shows the Hessian to be a hopeless guide to [dli/dwj], both
qualitatively and quantitatively.
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