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Purchasing Power Parity: A Time Series Analysis of the U.S. and Mexico, 1995-2007

机译:购买力平价:1995-2007年美国和墨西哥的时间序列分析

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摘要

This paper presents indirect evidence that absolute purchasing power parity (PPP) may hold in the long-run between Mexico and the U.S., but due to data limitations, the relationship could not be tested directly. Thus it is not clear if absolute PPP holds in the long run between the U.S. and Mexico. Given that relative PPP is a necessary, but not sufficient, condition for absolute PPP to hold, this study tests the relationship between the change in the log of the exchange rate, and the changes in the log of the U.S. producer price index (PPI) and the Mexican PPL Here, the absence of relative PPP would indicate that absolute PPP could not hold. Given that all the relevant variables in first difference log are stationary, PPP in its relative form holds and OLS can be applied directly in a VAR model setting, viz., treating all variables initially as potentially endogenous. The estimates indicate one-way Granger causality from the percentage change in the exchange rate to the percentage change in the Mexican price level, which is not an implausible result for an emerging nation such as Mexico which imports a significant fraction of (dollar denominated) intermediate products and capital inputs.
机译:本文提供了间接证据,即从长期来看,墨西哥和美国之间可能会保持绝对购买力平价(PPP),但是由于数据限制,这种关系无法直接进行检验。因此,目前尚不清楚美国和墨西哥之间的长期PPP是否成立。考虑到相对购买力平价是保持绝对购买力平价的必要但不充分的条件,因此本研究测试了汇率对数变化与美国生产者价格指数(PPI)对数变化之间的关系。墨西哥PPL在这里,相对PPP的缺失将表明绝对PPP无法成立。假定第一差异日志中的所有相关变量都是固定的,则PPP以其相对形式成立,并且OLS可以直接应用于VAR模型设置中,即最初将所有变量视为潜在内生的。估计值表明,从汇率的百分比变化到墨西哥价格水平的百分比变化的单因素格兰杰因果关系,对于像墨西哥这样的新兴国家来说,这不是一个令人难以置信的结果,因为墨西哥进口了很大一部分(以美元计价)的中间产品产品和资本投入。

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