和DS原论文不太一样，有收益

我有超低茄加威fake0874

讲义中的模型类似于D-S原文的Constant-Elasticity Case，但是没有考虑产业之外的其他产品 x0。不过这个简化模型倒是和Krugman 1980, Melitz 2003比较接近。

More detail:
This document derives some of the most basic "Dixit-Stiglitz lite" equations step-by-step. It is aimed at students encountering this demand system for the very rsttime, in hopes that it will ease their journey into homework assignments and journal articles that feature a "near-impenetrable soup of CES algebra" (Neary, 2001). Those seeking a less rudimentary introduction should consult the appendix of Baldwin, Forslid, Martin, Ottaviano, and Robert-Nicoud (2005).

By Jonathan I. Dingely
9 June 2009

不错不错，好资料