汇率非线性因素在部分亚洲货币汇率中的特征——检验购买力平价论的新方法

当真实汇率运动实际上是非线性过程,而假设它为线性时,那么检验购买力评价理论的标准单位根检验通常是低效力的。文章运用带有单位根的门限自回归模型模拟了包括中国在内的6个亚洲主要新兴市场国家货币兑美元的真实汇率,发现它们都具有较强的非线性,说明了传统的线性方法不再具备模拟真实汇率的能力,且除人民币以外的其他5种货币的真实汇率都表现出了平稳非线性特征,在异动时期具有均值回归的趋势。周期性的金融危机是导致中国以外的其他5个国家货币的真实汇率出现异动的主要因素。人民币真实汇率的非线性行为则表现出了与其他国家不同的特点,导致它出现异动的主要因素为人民币对内和对外价格的相互背离,人民币真实汇率没有表现出向均值调整的趋势,甚至在异动时期呈现了向均值偏离的趋势。     

Purchasing Power Parity and Interest Parity in the Laboratory

This paper analyses purchasing power parity and uncovered interest parity in the laboratory. It finds strong evidence that purchasing power parity, covered interest parity, and uncovered interest parity hold. Subjects are endowed with an intrinsically useless (green) currency that can be used to purchase another useless (red) currency. Green goods can be bought only with green currency, and red goods can be bought only with red currency. The foreign exchange markets are organised as call markets. In the treatment analysing purchasing power parity, the price of the red good varies. In a second treatment, the interest rate on red currency varies. In a third treatment, the interest rate on red currency varies, and the price of the red good is random.     

Revisiting Purchasing Power Parity in OECD

This study revisits Purchasing Power Parity theory (PPP) in the 34 OECD countries during January 1994–August 2013. We use a new panel stationary test with both sharp breaks and smooth shifts, a novel approach to panel unit-root testing, proposed by Bahmani–Oskooee et al. (2014). The results indicate that the PPP holds in half of the 34 OECD countries. These results indicate the importance of proper modelling of both sharp breaks and smooth shifts in real effective exchange rate series of OECD countries.     

Theory and Tests of Generalized Purchasing-Power Parity: Common Trends and Real Exchange Rates In the Pacific Rim

The paper develops the theory of generalized purchasing-power parity (G-PPP) to explain the “stylized facts” of real exchange-rate behavior. the fundamental economic variables determining real exchange rates are nonstationary; thus, real rates are nonstationary. If the fundamentals are sufficiently integrated, as in a currency area, the real rates will share common trends. the theory is tested using the Pacific Rim nations. It is shown that G-PPP holds between each of the Pacific Rim nations and the large industrialized countries. There is only mild evidence that G-PPP holds among the Pacific Rim nations as a group.     

Internal Relative Price Stationarity in Long-Run Purchasing Power Parity

This study demonstrates that the joint relationship among domestic traded-goods prices, dometic nontraded-goods prices, foreign traded-goods prices, and foreign nontraded-goods prices is important to understanding rejections or confirmations of long-run PPP. This joint relationship is defined as the "cross-country internal relative price structure." For nine of the ten pairs of countries studied, the cross-country internal relative price structure is found to be stationary; thus, factors other than the influence of nontraded-goods prices must be responsible for the rejections of long-run PPP.     

汇率、利率、税率：名义和实际

当前我国经济运行情况以及面临的问题 过去的一年里，我国经济保持了稳定增长的态势，在全球经济特别是关、日和欧三大经济体同时陷入衰退的情况下，2001年我国国内生产总值达到95800多亿元，同比增长率为7．3％。更令人感到鼓舞的是，中国在2001年加入WTO，正式成为世界贸易组织的一员，中国的对外开放进入了一个新的阶段。 但在成功数字的外表下，我们还应该看到中国经济的一些问题以及在2002年可能遇到或者已经遇到的一些难题。2001年中国经济增长前高后低，四个季度的经济增长一路滑坡，前3个季度的增长速度分别是8．1％、7．8％和7％，第4季度GDP增长也很难达到7％，11月份居民消费价格总水平比去年同月下降3％，又面临通货紧缩的威胁。2001年的经济增长，主要是由国内投资和消费需求的增长拉动的。由于国际经济严重衰退，一方面，我国出口增速下降，大约在6％左右，净出口减少，对经济增长的贡献度为负值；另一方面，促使外资流入加快，实际利用外资增长近20％，减弱了出口下降的影响。……     

Purchasing Power Parity and the European single currency: Some new evidence

The effect of the single currency on the Purchasing Power Parity (PPP) hypothesis is examined in this study for the 15 EU countries, vis a vis the US dollar, before and after the advent of the euro. Standard as well as nonlinear unit root tests are employed on the time series dimension. Unit root tests reject PPP and the highest half-lives are observed after the introduction of the single currency. Panel unit root (Pesaran, 2007) and stationarity tests (Hadri and Kurozumi, 2008) that take into account cross-sectional dependence are also estimated. The results remain inconclusive as panel stationarity tests fail to support PPP whereas panel unit root tests fail to reject PPP for the whole sample and for the period before the introduction of the single currency.     

Long-Run Purchasing Power Parity and Structural Change: The Official and Parallel Foreign Exchange Markets For Dollars In Greece

This paper examines the Purchasing Power Parity theory from a long-run perspective in the presence of a parallel or 'black' market for US dollars in Greece using monthly data for the recent float. Johansen's FIML multivariate cointegration techniques is applied. Recent development associated with this procedure are considered. First, a formal test developed by Paruolo (1996) for the presence of I(2) and I(1) components in a ultivariate context is applied along with the estimation of the roots of the companion matrix for the correct determination of the cointegration rank. Second, given that two significant cointegration vectors were found, structural restrictions identifying the long-run relations of interest are specified as proposed by Johansen and Juselius (1994) and Johansen (1995b). Thus, the joint structure of PPP and long-run informational market efficiency could not be rejected. Furthermore, estimation of the error correction terms shows that the black market rate adjusts to eliminate any deviation from long-run PPP. Finally, stability tests proposed by Hansen and Johansen (1993) are applied and it is shown that the dimension of the cointegration space is simple dependent while the estimated coefficients do not exhibit instability in recursive estimations. [F31 F33]     

人民币升值背景下再谈购买力平价

中国人民银行于近日宣布人民币对美元汇率升值2%.在这一背景下,本文简要回顾了购买力平价理论（PPP）,并总结了国际上对中国购买力的测算方法,同时针对人民币汇率与我国PPP之间的较大差异,提出产生偏差的具体原因.最后得出结论：必须结合我国自身的改革进程和现实经济的运行特点来分析购买力平价,才能确定人民币汇率的合理水平.     

Productivity Trends in Europe: Implications for Real Exchange Rates, Real Interest Rates, and Inflation

The paper examines a long–run (neoclassical) framework in which differences in productivity growth across sectors and countries lead to inflation differentials. In a currency union, these inflation differentials imply cross–country differentials in real interest rates. The authors estimate the likely size of these differentials for European Union countries, discuss the potential costs of persistent inflation differentials, and comment on the conflicts they may cause within Economic and Monetary Union (EMU). The analytical framework is a variant of the Balassa–Samuelson "productivity hypotheisis," which relates sectoral productivity trends to trends in the relative price of home goods.     

The Hysteretic Effects on the Real Exchange Rates

In this paper we investigate the dynamics developed from the exchange rate relative price relationship using a hysteresis framework. The rationale for such hysteretic effects is in terms of firms' unresponsiveness to the exchange rate changes due to pricing to market-type arguments.The empirical support of these ideas is derived by applying a linear approximation of the hysteretic effects.We conclude that the hysteretic effects are a source of non-linearity, strongly affecting the long-run relationship of exchange rate and prices.     

The Canadian Dollar and Purchasing Power Parity during the Recent Float

This paper re-examines the purchasing power parity (PPP) concept for five bilateral Canadian dollar exchange rates. The Johansen cointegration technique is employed. Evidence is found in favor of PPP when wholesale prices are used but not when consumer prices are utilized; whereas, in all but one case, it is not possible to reject the symmetry and proportionality hypotheses. Furthermore, it is shown that the dimension of the cointegration space may exhibit sample dependency, but the estimated coefficients are stable in recursive estimations. Finally, by implementing the multivariate KPSS test for the null hypothesis of cointegration, Johansen's results are overturned.     

Purchasing Power Parity and Price Fluctuations in China before July 1937

In this paper, we provide an empirical investigation of the purchasing power parity (PPP) hypothesis for China before July 1937. Using the monthly data from 1922 to 1937, we find clear and consistent evidence in favor of the purchasing power parity relationship. This naturally leads to the conclusion that the degree of Chinese market integration with the West was substantial before July 1937. These findings offer an empirical interpretation of the rise and fall of the Chinese price level during the Great Depression. It also has further implications of the impact of the American Silver Purchase Act of 1934 and the assessment of the 1935 currency reform on the Chinese economy.     

Purchasing Power Parity and aggregation bias for a developing country: The case of Mexico

This paper investigates long-run Purchasing Power Parity (PPP) between the US and Mexico. We use a panel of disaggregated price data between the US and Mexico with a long time series to look at two types of aggregation bias. The first is examined in Imbs et al. — which we refer to as estimator aggregation bias — and the second is put forth by Broda and Weinstein — hereafter, data aggregation bias. The findings indicate substantial estimator aggregation bias and data aggregation bias. Although estimates using aggregate data and imposing homogeneous coefficients provide little evidence of PPP, findings with disaggregated data and heterogeneous coefficient estimators offer strong support. The results also suggest the presence of small-sample bias as examined in Chen and Engel, but with little effect on the qualitative results. Tradable goods and non-tradable goods show little distinction in convergence rates. Estimated half-lives are lower under flexible than fixed exchange rates and indicate rapid convergence during the Mexican peso crisis.     

Convergence to Purchasing Power Parity at the Commencement of the Euro*

We investigate convergence towards purchasing power parity (PPP) within the eurozone and between the eurozone and its main partners using panel data methods. We find strong rejections of the unit‐root hypothesis, and therefore evidence of PPP, in the eurozone for different numéraire currencies, as well as in the eurozone plus the United States with the dollar as the numéraire currency, starting between 1996 and 1999. The process of convergence towards PPP, however, begins earlier, following the currency crises of 1992 and 1993, adoption of the Maastricht Treaty, and official completion of the Single Market.     

Purchasing Power Parity in the Transition: The Case of the Romanian Leu Against the Dollar

This article uses co-integration analysis to test purchasing power parity for the Romanian leu against the US dollar. The fact that the purchasing power parity (PPP) hypothesis is not rejected leads to the conclusion that the real appreciation of the leu against the dollar over the transition has not been due to an appreciation of the equilibrium real exchange rate. Rather it is simply the consequence of the leu being devalued beyond the equilibrium level at the start of reform and slowly returning to its constant equilibrium real rate. There is evidence that the adjustment to equilibrium has fallen almost entirely on the price level, so that a major consequence of the excessive undervaluation has been higher inflation.     

On the Joint Test of the Uncovered Interest Parity and the Ex‐ante Purchasing Power Parity

This study revisits the relation between the uncovered interest parity (UIP), the ex‐ante purchasing power parity (EXPPP) and the real interest parity (RIP) for the UK and Japanese vs US data. The original contribution is on developing some joint coefficient‐based tests, obtained by rewriting the UIP, the EXPPP and the RIP as a set of cross‐equation restrictions in a vector autoregression (VAR) framework. Test results point to a “forward premium” bias in both the UIP and the EXPPP. The latter result is novel in the literature and stems from testing the PPP in expectational terms. Moreover, the results suggest a currency‐dependent pattern for the UIP, contrarily to the EXPPP equation. Finally, it is shown that conditioning the VAR on M3 growth differential has important explanatory power in resolving the aforementioned biases in both the UIP and EXPPP equations for the UK vs US data. At the same time, variables having a strong forward‐looking component (i.e. share prices) help recover a unitary coefficient in the UIP equation.     

Productivity Trends and the Sterling Real Exchange Rates*

This paper provides favorable econometric evidence for a productivity‐based model of the pound/euro real exchange rate. We find that a 1% increase in UK productivity is consistent with a 3.5% real depreciation of sterling. Likewise, a 1% increase in euro area productivity is compatible with a 5.16% real appreciation of sterling. The asymmetric response of UK and foreign productivity shocks corresponds well with our model if UK labor supply is more elastic than euro area labor supply. Estimates of equilibrium exchange rates suggest that sterling was not overvalued at its 2004Q3 level vis‐à‐vis the euro.     

Testing for Long Run Purchasing Power Parity: An Examination of Korean Won

My small-scale macroeconomic model of the Taiwanese economy contains behavioral equations to explain saving, investment, the rate of economic growth, export demand, export supply, and import demand. Exploiting the two definitions of the current account (national saving ? omestic investment and export + net factor income from abroad ? imports), the in-sample dynamic simulation tracks the current account remarkably well. If the Taiwanese government pursued deliberate policies to reduce the current account surplus, this model indicates that the effects on the economy would depend critically on whether the current account surplus was eliminated by reducing national saving or by raising domestic investment. [430]