Real exchange rates and unit root tests

Real Exchange Rates and Unit Root Tests. — This paper examines monthly OECD exchange rate data (1979–1997) using univariate and panel data unit root tests. Some of these tests support the hypothesis of a unit root. But tests of cointegration reveal the existence of weak purchasing power parity relationships between bilateral nominal exchange rates and relative prices. We suggest that researchers need not conduct unit root tests on real exchange rate data when a modified version of PPP is used; or if there is a long enough time series. Given the definition of real exchange rates, the indicator should be stationary and should have intrinsic mean reverting behaviour.     

Price variability and price convergence: Evidence from Indonesia

This paper evaluates price variability and price convergence in Indonesia. Using price indices of 35 products in 45 cities from January 2002 to April 2008, this study shows that, during the observed period, prices in Indonesia converged to the ‘relative’ law of one price. The price variability of one product across cities is found to be smaller than the price variability of all products within a city. Transportation costs and the level of development matter to price variability. This study also reveals that the average speed of convergence, which is measured by the half-life, for perishable goods is about 9 months, non-perishable goods 32–36 months, and services 18–19 months, while the median of the half-life of all products is about 16–17 months. The speed of convergence depends on the initial price difference, but not the distance between cities.     

Does the law of one price hold in China? Testing price convergence using disaggregated data

This study examines to what extent prices diverge across China and how long it takes prices to converge following idiosyncratic shocks. We consider monthly data using disaggregated goods prices from 36 cities in China. Following [Imbs, J., Mumtaz, H., Ravn, M., and Rey, H., 2005. PPP strikes back: aggregation and the real exchange rate. Quarterly Journal of Economics 120, 1–44.], we use two estimation methods: a fixed effect method when considering goods individually and a mean group estimation specification for a panel including all goods simultaneously. The mean group method also accounts for dynamic heterogeneity across goods. Impulse response functions are obtained to calculate half-lives. With both methods, we find half-lives of only a few months or less, supporting the conjecture that convergence rates within a country are faster than rates estimated in an international context. However, the half-life reported here is still shorter than that for other studies using disaggregated intracountry data. Perhaps a lower degree of specialization and market differentiation in developing countries creates a greater potential for price convergence.     

METROPOLITAN HOUSE PRICES IN SOUTH AFRICA: DO THEY CONVERGE?

The question this paper investigates is whether or not different metropolitan areas each constitute a separate housing market or whether or not there is a single South African housing market. Theory on the Law of One Price suggests that if products or geographic areas belong in the same market, their absolute prices must converge, so that their relative prices are stationary. By using cross-sectional time series data of five metropolitan areas, the paper tests for the Law of One Price by applying the Im, Pesaran and Shin panel unit root test. The paper finds strong evidence of convergence in large middle-segment house prices and weaker support for convergence in medium middle-segment house prices. In addition, the paper finds no evidence for convergence in small middle-segment house prices. This suggests the existence of a national market for large and possibly middle-segment houses in metropolitan areas, but separate metropolitan markets for small middle-segment houses. In addition, the paper estimates the speed of convergence and finds that large middle-segment house prices converge within two to seven quarters, while the speed of convergence for medium middle-segment house prices in three of the five areas is five to eight quarters.     

Are China's energy markets cointegrated?

The paper investigates energy price co-movement over the period 01/1999–12/2005 for China as a whole, and over sub-periods and for seven regions, using panel unit root and panel cointegration tests developed by Pedroni (1999, 2004). The results suggest that not all energy sources are spatially homogenous in prices and the processes of energy price cointegration are different over sub-periods; over groups of fuels; and over regions. Coal and electricity prices have co-moved since 2003 while gasoline and diesel prices have co-moved since 1997. The results show that there are clearly variations in the emergence of energy price co-movement over regions, implying that regional fuel markets have emerged in China. Important lessons that can be learnt from the results are that an energy market has, to some extent, already emerged in China and, as a result, energy prices are substantially less distorted than before. If correct, these findings have significant global implications both in terms of future emission reductions, emission trading and trade negotiations where China should be treated as a ‘market driven economy’.     

Financial integration in East Asia: Evidence from panel unit root and panel cointegration tests

The aim of this paper is to investigate the degree of financial integration for selected East Asian countries from 1988 to 2006 using the recently developed panel unit root and panel cointegration techniques. Investment and savings rates are found to be nonstationary and not to be cointegrated in panels. We estimate modified Feldstein–Horioka equations and our results reveal a high degree of financial integration. When we homogenize our data, results show that high-income countries have stronger financial integration than middle-income countries. Finally, we proceed to stability tests in order to test if there is a crisis effect and we find that financial integration is stronger in the post-crisis period.     

对费雪效应的重新考察:来自面板协整的国际新证据

本文利用50个国家1981～2007年的面板数据重新考察了费雪效应.面板单位根检验发现,利率和通货膨胀率均存在单位根;异质面板协整检验的结论认为,弱费雪效应显著成立;利用完全修正的OLS和动态OLS方法对发达国家和发展中国家分别进行估计和检验,发现发展中国家存在弱费雪效应,而发达国家存在严格费雪效应;文章最后讨论了本文研究结论的货币政策含义,分析了中国利率政策实施中的问题并提出了建议.     

Analysis of the Interactive Linkages Between Gold Prices,Oil Prices,and Exchange Rate in India

This study investigates the co-movements and linkages among gold prices, oil prices, and Indian rupee–dollar exchange rates for the time span of 12 January 2004 to 30 April 2015 to investigate whether Indian economic policy-makers should detach financial policies from energy policies. Various econometrical methods such as Johansen’s cointegration test, vector autoregressive model, Granger causality test, and impulse response were used to explain the co-movements among the variables. We find that gold prices, oil prices, and rupee–dollar exchange rates stay substantially independent from each other, which denotes energy policies and financial policies must be detached.     

Does the dispersion of unit labor cost dynamics in the EMU imply long-run divergence?

Using unit labor cost (ULC) data from Euro area countries as well as US States and German Länder we investigate inflation convergence using different approaches, namely panel unit root tests, cointegration tests and error-correction models. All in all we cannot reject convergence of ULC growth in EMU. However, country-specific deviations from the rest of the currency union are much more pronounced and much more persistent in Europe than in the US or Germany. This holds before and after the introduction of the common currency. Hence, asymmetric shocks in the future might take a long time to dissipate.     

Testing for output convergence: a re-examination

This paper investigates output convergence for the G7 countriesusing panel time-series techniques. We consider both the nullhypotheses of no convergence and convergence. It is shown thatinferences on output convergence depend on which one of thetwo null hypotheses is considered. Further, the no convergenceresults reported in previous studies using the time-series definitionmay be attributed to the low power of the test procedures beingused. Our results also highlight some potential problems oninterpreting results from some typical panel unit root and stationaritytests.     

Total Factor Productivity of the Japanese Rice Industry

We calculate partial factor productivity and total factor productivity (TFP) indices for rice production using panel data across 42 Japanese prefectures from 1996 to 2006, and perform panel unit root tests of TFP convergence across prefectures. We find that during this period, the partial factor productivity growth rates for capital, land and materials stagnated at the aggregate national level, as did the TFP growth rate, despite a large increase in labor productivity. We also identify evidence of a convergence in TFP across Japanese prefectures.     

Does purchasing power parity hold in African less developed countries? Evidence from a panel data unit root test

This study tests for long-run relative purchasing power parityamong a sample of 27 African less developed countries. For thispurpose, a new test advocated by Im and co-workers is employedwhich allows one to test for unit roots in heterogeneous paneldatasets. This is known as the t-bar test, by which purchasingpower parity is confirmed or rejected on the basis of whetheror not the average augmented Dickey-Fuller statistic based ondemeaned data is significantly different from zero. Using quarterlydata covering the period 1974-97, purchasing power parity isgenerally rejected using individual country unit root testsbut support is found using the t-bar test. This suggests thatlow power problems in testing for purchasing power parity canbe overcome using this panel data procedure. The findings alsosupport the view that purchasing power parity is most likelyto be found among high inflation less developed countries andthat the half-life of a one-off random shock to parity is approximatelysix quarters. These results are generally confirmed for the1960-73 period.     

三大重点能耗部门能源消费的面板协整分析

将面板数据模型和协整理论结合起来,以1985—2008年我国三大重点能耗部门（工业、建筑和交通运输部门）的截面数据为依托,构建能源消费的面板协整模型。实证分析了我国三大重点能耗部门的能源消费和产业产值之间的面板协整关系。在得出变系数的面板模型达到基础上,对模型进行面板单位根检验和面板协整检验,得出长期稳定的均衡关系。结论对于三大重点能耗部门制定能源发展战略奠定了基础。     

Estimating the export and import demand for manufactured goods: The role of FDI

In this paper we estimate the demand for exports and imports of manufactured goods for a panel containing the majority of the EU countries as well as the United States and Japan. The model includes as explanatory factors both the traditional determinants of trade and also the stock of foreign direct investment (FDI). We apply panel unit root and cointegration tests allowing for heterogeneity. Whereas there is no evidence of cointegration when using just the traditional formulation, the results are favorable to the existence of long-run relationships linking the variables of the augmented model. Moreover, the results point mainly to a complementary relationship between trade and FDI.     

Estimating the export and import demand for manufactured goods: The role of FDI

In this paper we estimate the demand for exports and imports of manufactured goods for a panel containing the majority of the EU countries as well as the United States and Japan. The model includes as explanatory factors both the traditional determinants of trade and also the stock of foreign direct investment (FDI). We apply panel unit root and cointegration tests allowing for heterogeneity. Whereas there is no evidence of cointegration when using just the traditional formulation, the results are favorable to the existence of long-run relationships linking the variables of the augmented model. Moreover, the results point mainly to a complementary relationship between trade and FDI.     

The Wealth-Health Nexus: New Global Evidence

Using a world sample of countries, this paper re-examines the U-shaped relationship between per capita GDP (wealth) and life expectancy at birth (health). Since cross-sectional dependence across countries is detected, second-generation panel unit root and cointegration tests are employed. All the variables are found to be integrated in one order as well as cointegrated. Various quadratic specifications are also employed and the hypothesis is confirmed.     

The residential demand for electricity in Japan: An examination using empirical panel analysis techniques

This paper examines the residential demand for electricity in Japan, excluding Okinawa-prefecture, from 1975 to 2005 as a function of the disposable income per household and the overall unit price of electricity for general consumers, by using the empirical panel analysis techniques of a panel unit root test, a panel cointegration test, and group-mean dynamic ordinary least squares (DOLS) estimators to determine whether or not each variable is stationary. This study's contribution is twofold. First, for a more accurate empirical economic analysis, it divides Japan into a number of regions so that the estimation of coefficients becomes more powerful due to the increased degree of freedom from the utilization of the panel data. Second, the study chose Japan for this analysis on the basis of discussions regarding the deregulation of the residential electric power supply that is scheduled for the near future. All variables—sales per household, price, and income per household—can be assumed to have a unit root and cointegration relationship. The results determine that the price effect is negative and elastic and that the income effect is inelastic. These results correspond to other such studies on developed countries that are significant economic powers.     

A nonlinear pairwise approach for the convergence of UK regional house prices

We examine the long-run convergence across 12 UK regional house prices using a pairwise approach. The time period spans from 1983:1 to 2012:4. Linear, nonlinear and asymmetric unit root tests are considered for assessing the stationarity of all possible pairs. The test statistic for convergence is based on the percentage of unit root test rejections across all regional house price differentials. The percent of the pairs that reject the null increase from 6% in the linear ADF case to 53% for the nonlinear unit root. Probit analysis reveals that house price differentials in the South are more likely to be stationary and as a result tend to converge more compared to the North.     

私营企业就业人数的面板数据分析

为对我国私营企业就业人数的现状进行分析,以人口、人均GDP、高等学校数和高等学校毕业人数为指标,选取我国2001-2008年31个省市的多指标面板数据对我国私营企业就业人数进行分析。结果表明:私营企业就业人数、人口和人均GDP均为非平稳序列,私营企业就业人数与人口和人均GDP之间存在着显著地稳定关系;一个地区的人口数对该地区私营企业就业人数的作用大于人均GDP对该地区私营企业就业人数的作用。