PURCHASING POWER PARITIES IN INTERNATIONAL COMPARISONS: QUANTITY vs. PRICE COMPARISONS

Just as intertemporal price indices have two functions, to measure price changes and to deflate current values to constant values, this is true also for interspatial price indices, purchasing power parities (PPPs). In practice these two functions of PPPs, for conversion and for comparing price levels, are not always distinguished, and this may have some disadvantages since in a number of cases the differences between the two PPPs might be considerable. The authors review the differences in content of the two types of PPPs, and make some suggestions for making the distinction more explicitly.     

SPACE AND TIME COMPARISONS OF PURCHASING POWER PARITIES AND REAL VALUES

The calculation of purchasing power parities and quantity comparisons for a given year provides interesting information about the relative importance of countries. However, it is necessary to make these estimates annually in order to enable users to apply these parities for international comparison of annual data expressed in national currency. The paper deals with the problems related to merging spatial comparisons and temporal volume and price movements for the countries of the European Community. For these countries full information was collected in 1975 and in 1980, whereas in the intermediate years some price data were collected and price indices at a detailed level have also been collected. First the theoretical problems of consistency between the spatial results and temporal indices are discussed. Because no immediate consistency can be obtained, several methods are proposed to achieve consistency, by estimating one unique set of spatial and temporal indices. The available information for the period 1975-80 has been used in order to test the numerical differences between two sets of parities and price indices over time. Besides theoretical reasons for inconsistency, it is also necessary to take into account errors in the price observations or in the price indices. The results presented in the paper should be considered as provisional and further work will be undertaken to obtain better insights into the inconsistency between these sets of data.     

Mind the Gap! International Comparisons of Productivity in Services and Goods Production

Abstract. In this paper, we make a comparison of industry output, inputs and productivity growth and levels between seven advanced economies (Australia, Canada, France, Germany, the Netherlands, United Kingdom and United States). Our industry-level growth accounts make use of input data on labour quantity (hours) and composition (schooling levels), and distinguish between six different types of capital assets (including three information and communication technology (ICT) assets). The comparisons of levels rely on industry-specific purchasing power parities (PPPs) for output and inputs, within a consistent input–output framework for the year 1997. Our results show that differences in productivity growth and levels can be mainly traced to market services, not to goods-producing industries. Part of the strong productivity growth in market services in Anglo-Saxon countries, such as in Australia and Canada, may be related to relatively low productivity levels compared with the United States. In contrast, services productivity levels in continental European countries were on par with the United States in 1997, but growth in Europe was much weaker since then. In terms of factor input use, the United States is very different from all other countries, mostly because of the more intensive use of ICT capital in the United States.     

DISTRIBUTIONS OF REAL INCOME: WITHIN COUNTRIES AND BY WORLD INCOME CLASSES

Income and expenditure data from 14 countries (representing one-third of the world's population), mostly from the 1970s, are used to construct national income distributions and , after normalizing by purchasing power parities, to construct a "world" distribution of real income. The density of real-income equivalent groups (socio-economic classes) across countries is measured for the "affluent," the "well-off," and the "poor." In comparison with earlier studies, most national distributions of income seem to have been improving, the numbers of those in poverty (based on real income) are lower, and, most important (and disturbing for some) is that the "affluent" class (and those above "middle class" income levels) has (prematurely) swelled in a number of developing countries.     

INTERNATIONAL COMPARISON OF PURCHASING POWER, REAL OUTPUT AND LABOUR PRODUCTIVITY: A CASE STUDY OF BRAZILIAN, MEXICAN AND U.S. MANUFACTURING, 1975

This study has a twofold objective: (a) a substantive analysis of purchasing power parities (PPP's), real output and labour productivity in Brazil, Mexico and the U.S.A.; and (b) a methodological survey of the analytic problems in measuring PPP's from the production side, rather than the expenditure approach used by the United Nations (ICP). Our main substantive findings were that PPP's for manufacturing did not vary greatly from the 1975 exchange rates, that labour productivity was surprisingly high in the two Latin American countries, and that there are substantial differences in the coverage of national accounts between Mexico and Brazil. We found census concepts of value added to be rather anachronistic, particularly in the U.S.A.; we developed a new short-cut matching procedure for industries with a complex product structure; and we found the unit value approach not inferior to the specification pricing practiced by ICP.     

Price and quantity in international comparisons of health care expenditure

An important omission from earlier cross-national comparisons of health care expenditure has been the failure to distinguish between price and quantity. Using recent data on purchasing power parities, the purpose of this article is to report some preliminary results regarding health care expenditure and quantity across 22 OECD countries. The article concludes that, contrary to what has been suggested in some recent articles, the relative price of health care is not correlated to the aggregate per capita income. The fraction of the national income that is devoted to health care provision increases with the per capita income regardless of whether health care is measured in terms of expenditure or quantity. The relative price of health care has a rationing effect on the quantity of health care that is offered, with a price alasticity close to minus one. The latter finding means that the health care expenditure is not greater in countries with higherprices. Furthermore, the differences in health care expenditure or quantity between countries persist after correction for the relative price and the income level. Part of these differences can be explained by differences in the definition of health care in the various countries.     

Is the Engel curve approach viable in the estimation of alternative PPPs?

Conventional estimates of purchasing power parities (PPP) rely on cross-country price data. Using Engel curves, Almås (Am Econ Rev 102:1093–1117, 2012) was, however, able to show that PPPs contain substantial bias. Since constructing conventional estimates is expensive and time consuming, Almås’ idea of employing Engel curves is welcome. This article examines the viability of the Engel curve approach to PPP and its sensitivity to differences in relative prices and preferences by estimating Engel curves not only between countries but also for regions within a given country. My empirical evidence from the United States and Norway suggests that the differences can be problematic, but not sufficiently to discredit the new methodology. A pragmatic approach to PPP estimation between countries that are different is to compute a PPP band, rather than a point estimate. I present a practical example of this using expenditure data from 2001, which yields a band for NOK and US dollar.     

POPULATION AGEING,CAPITAL INTENSITY AND LABOUR PRODUCTIVITY

This paper analyses the implications of population ageing for the capital intensity of output and, therefore, labour productivity. Population ageing leads to sectoral shifts in demand for goods and services. If such shifts occur between goods that differ in their capital intensity, there will be a change in the average capital intensity of the economy and, therefore, in average labour productivity. In order to gauge the magnitudes of such effects, the present paper reports simulations of a calibrated model with two final goods and two intermediate goods, using data for two Pacific Rim countries for comparison: the United States and Australia. The data for these countries suggest that population ageing will, on average, shift expenditure towards goods with a relatively high capital intensity. The magnitude of the increase in labour productivity according to the simulations is likely to be small, but perhaps not trivial: in the order of 1–4% per annum by 2050. This might partially offset the negative effect of ageing on living standards.     

A Comparison of Purchasing Power Parity between the Pound Sterling and the Australian Dollar in 1979*

This paper attempts to compare the cost of living in Australia and the United Kingdom. The comparisons are made on the basis of price and expenditure shares information provided predominantly by the Australian Bureau of Statistics and the Department of Employment, London, and from a private survey conducted by one of the authors in London and Sydney in December 1979. Due to the nature of the data, absence of quantity information, it was necessary to employ a new index number method derived by one of the authors.     

THE LEVEL OF WORLD INEQUALITY: HOW MUCH CAN ONE SAY?

This paper constructs estimates of income and consumption inequality for the world (124 countries), using various measures of inequality. It then goes on to examine the possible effects of various sources of error in the estimates, and attempts to set rough limits to the size of such effects. Among the sources of error examined are purchasing power parities used for currency conversion, systematic errors in estimates of per capita incomes, differences in age structure, government tax and expenditure policy, and lifetime income effects. The paper concludes that, although the level of uncertainty in the estimates is too great to permit conclusions about, for instance, trends over time, it is clear that the level of world inequality is extreme, and that it is primarily due to differences in average incomes across countries rather than to intra-country inequality.     

INTERNATIONAL AND INTERTEMPORAL COMPARISONS OF REAL PRODUCT IN OECD COUNTRIES A GROWTH SENSITIVITY ANALYSIS

This paper provides two new data sets for comparisons of real income in OECD countries. The first set provides adjusted real series for GDP and its components from 1960 to 1993 based on OECD 1990 purchasing power parities. The second set uses OECD PPP of different benchmark years, and interpolates these applying national price indices. Comparisons between both alternatives, Penn World Tahle Mark 5 (PWT 5) and its new version (PWT 5.6), in terms of economic growth and convergence, reveal some remarkable differences. Moreover, there are wider differences concerning the relative countries' position in GDP per capita ranking. Estimations of convergence equations based on OECD data yield a better fit than those obtained using PWT data, although there are also some significant differences between PWT 5 and PWT 5.6. Nevertheless, a very positive result is that other parameters of interest in these equations are not affected by the use of these different data sources.     

MEASURES OF TOTAL HOUSEHOLD CONSUMPTION

By expenditure on education, health, housing and other public services, governments provide many goods and services which are alternatives to, or additional to, household expenditure on consumption. In most Western national accounts, the two forms of consumption are rigidly separated. Yet the combination of the two–the concept of total household consumption–has obvious importance for the measurement and comparison of living standards and for the formulation and analysis of policy. This concept is recommended as an additional aggregate in the revised SNA. It is displayed in the UN International Comparison Project (ICP). It is used as a major aggregate ("total consumption of the population"), although hitherto generally excluding nonmaterial services, in the Material Product System. Yet it is rarely shown explicitly in Western national accounts. One reason is the slow progress in the analysis by purpose of government expenditure.
This paper shows how far figures of total household consumption, and of its division between collective and private consumption, can in fact be derived, for the advanced countries, from the data provided to the UN Yearbook of National Accounts , supplemented b y the ICP. The results show first the wide national variations in the relation between the two forms of consumption but, secondly, the gaps in information on this crucially important topic. The relation between direct government expenditure for collective consumption and transfer payments to households ("social income") is also examined. High and low levels of these two forms of State support to consumption reinforce each other almost as often as they offset each other. But, again, the data provided by national accounting statistics are very incomplete.
This paper was prepared for the 16th General Conference of the IARIW, August 1979.     

Estimating Purchasing Power Parities from Household Expenditure Data Using Complete Demand Systems with Application to Living Standards Comparison: India and Vietnam

This study departs from the previous literature on purchasing power parity (PPP) by proposing a demand system based methodology for calculating the PPP that takes account of consumer preferences and allows for the substitution effect of price changes. The methodology is used to calculate the PPP between the Indian Rupee and the Vietnamese Dong. The study allows for regional variation in preferences and price changes both inside the country and between countries. It proposes and applies a methodology for constructing prices from unit values after adjusting them for quality and demographic effects. The adjusted unit values are used as prices in the demand estimations, and the demand parameter estimates are used to calculate both spatial prices within each country and the PPP between the two countries within a consistent framework. The study illustrates the usefulness of preference consistent methods to calculate the PPP by applying the PPPs to compare living standards between India and Vietnam. The significance of the results follows from the fact that the levels of living comparisons are quite sensitive to the PPP used in converting the Rupee expenditure into Vietnamese Dong. The present results on food PPPs question the relevance of the PPPs from the ICP project in cross‐country welfare comparisons especially in a period of high food inflation.     

NEW INSIGHTS INTO THE STRUCTURE OF THE WORLD ECONOMY*

The United Nations' newly completed study of purchasing power parities covering 34 countries varied in region, income level, and form of economic organization shows the systematic differences between the usual view of the structure of the world economy arising out of international comparisons based upon foreign exchange rate conversions and the structure one sees when actual prices are available. The real per capita GDP of developing countries is understated relative to developed countries when exchange rates are used in converting countries' national income accounts to a common currency, with the degree of understatement for any two countries being inversely related to the per capita income difference between them. The reason for this is that relative prices in the non-traded goods sector are lower relative to traded goods prices in low income countries. The systematic pattern observed in the 1975 data of the 34 countries has been extrapolated over time and space to get estimates of GDP for other years and countries. In the absence of detailed price data, the real shares of final expenditures devoted to particular components of the total can only be estimated as the proportion of own currency total expenditure devoted to the components. The observed differences in the pattern of prices of poor countries relative to rich for different components makes this clearly wrong for international comparisons, and in systematic ways. For example, (i) the relative price of services compared with commodities in poor countries is lower than in rich; so the apparent tendency of the share of services to rise as a country's income rises disappears when real quantities are considered; similarly, (ii) the relative price of capital goods is greater in poor countries compared with rich ones, so the difference in investment ratios out of GDP between rich and poor countries is understated.     

Locational choice of AFDC recipients within California: a conditional logit analysis

This paper examines factors that influence migration of AFDC recipients within California. A county level conditional logit model is used to analyze the impact of cost adjusted benefits on intrastate moves during recipients’ first year of welfare participation. Costs of living, particularly housing costs, differ considerably across counties of California, yet the welfare benefit is set at the state level. This creates the potential for variation in the purchasing power of the welfare benefit if a family chooses to move. Variation in cost of living is shown to have a significant effect on migration patterns of AFDC recipients. Estimates suggest that a $150 decrease in fair market rent results in 15% more migration to the county. Recipients’ migration is more responsive to cost of living than migration of the general population.     

The changing skill of new immigrants to the United States: recent trends and their determinants

"The objective of this paper is to describe and understand the determinants of changes in the number and quality of new legal immigrants to the United States over the last 25 years. Our main interest is in understanding the behavioral response of potential immigrants to changes in the U.S. immigration law regime (as well as in the origin-country determinants of demand for immigration to the United States) and how these affect and have affected the skill composition of immigrants.... [The authors] assembled a new data set based on annual INS records of all new, legal immigrants over the period 1972 through 1995.... Inspection of our new data indicates that since the mid 1980s the average skill of new, U.S. legal immigrants has been rising relative to that of the U.S. population. An econometric analysis of a panel of country-specific measures of the skill of immigrants based on these data over the period 1972-1992 indicates that these changes are due in part to changes in immigration law and to the overall rise in the real purchasing power of countries outside the United States."     

Household Equivalence Scales: New Australian Estimates from the 1984 Household Expenditure Survey*

Equivalence scales are measures of the relative incomes required by households of different size and composition to attain a similar standard of living, and are used in analysis of consumer expenditure patterns as well as in judging the appropriateness of the structure of income maintenance payments. The paper reviews equivalence scales previously derived for Australia and presents a range of new estimates based on the 1984 Household Expenditure Survey.     

Is living in African cities expensive?

Although several studies have examined why overall price levels are higher in richer countries, little is known about whether there is a similar relationship at the urban and city level across countries. This paper compares the price levels of cities in Sub-Saharan Africa with those of other regions by analyzing price information collected for the purpose of calculating official purchasing power parities. The approach of the paper is to readjust the calculated price levels from national to urban levels, using known price-level ratios between those areas. The results indicate that African cities are relatively more expensive, despite having lower income levels. The price levels of goods and services consumed by households are 25 to 28 percent higher in Sub-Saharan Africa than in other low- and middle-income countries, relative to their income levels. Such high costs of living could constrain livelihood of low-income urban residents, as well as the development of Africa’s urban economies.     

我国健康保险有效需求的实证分析

有效保险需求是在当前特定时期内,在一定保险价格、一定购买力条件下现实的保险需求,是保险公司真正面对的业务来源。本文使用最近几年健康保险保费收入、城镇居民可支配收入、城镇基本医疗保险基金总收入及居民医疗保健支出等数据,通过建立回归模型对健康保险有效需求进行分析。结果显示：居民购买力和医疗费用的增长对我国健康保险的有效需求有显著影响,社会保险并未对商业健康保险产生替代作用,相反与健康保险保费收入同向增长。