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# Statistical presentation

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Prices and Consumption, Economic Statistics
Zdravka Bosanac
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Purchasing power parities (PPP) is an annual price level indicator which expresses the price level in a given country at a given time, relative to the price level in one or more countries. This means that PPP for a particular country indicate how many units of national currency are needed in that country to maintain the purchasing power of €1 in the EU. PPP can be calculated for individual products or aggregates, such as GDP.

### Data description

The purpose of calculating purchasing power parities is to enable international comparisons in real values. The PPPs are also used in compiling comparable indices for the price level in different countries.

To enable comparisons in real values among countries, it is essential to convert the amounts into a common currency. One option is to convert the amounts on the basis of the currency rate. However, when the currency rate for converting the amounts is applied, the comparisons do not make allowance for the differences in the national price level. If conversions are conducted on the basis of the currency rate there is a tendency in countries with a relatively high price level to overestimate the gross domestic product, whereas in countries with a relatively low price level, the gross domestic product is underestimated.

However, when PPPs are applied for conversion into a common currency, differences in the price level are taken into account. The purchasing power parity reflects the relative prices among two or several countries. The conversion of, e.g. a country's GDP into another currency with PPPs, is tantamount to calculating the GDP of the country in question at the prices of another country. This implies that comparisons in real values or in terms of quantities are conducted among the two countries.

Generally speaking, differences in real production and income among rich countries (with a relatively high price level) and poor countries (with a relatively low price level) are considerably reduced, when purchasing power parities are applied in converting the amounts, instead of applying currency rates. Furthermore the currency rate is often subject to violent fluctuation and as a result of a change in the currency rate; the country may suddenly appear richer or poorer in comparisons with other countries, even though there has been no changes in real values. Consequently, international comparisons should be conducted on the basis of purchasing power parities and not currency rates.

PPPs are also applied in analyses of relative price levels across countries. For this purpose, the PPPs are divided by the current nominal exchange rate to obtain a price level index (PLI) which expresses the price level of a given country relative to another, or relative to a group of countries like the EU28. The production of PPPs is a multilateral exercise involving the National Statistical Institutes of the participating countries, Eurostat and the OECD.

Indicators in Statistics Denmark Statbank: - Purchasing power parities (PPPs) scaled to the sum of expenditures of the EU Member States expressed in euro. This means that the PPP of one particular country indicates how many units of national currency one would need in that country in order to maintain the purchasing power of one euro in the EU. - Price level indices (PLIs) defined as ratio between PPPs and current nominal exchange rate. - Volume indices of real expenditure per inhabitant. - Real expenditure per inhabitant defined as nominal expenditure divided by the PPP. - Volume indices of real expenditure per inhabitant.

### Classification system

PPPs are produced in accordance with the final expenditure classification of the European Standard of Accounts (ESA 2010).

PPPs are classified by type of final expenditure - actual individual consumption expenditure, actual collective consumption expenditure and capital expenditure - and, in the case of actual individual consumption expenditure, by purchaser - households, non-profit institutions serving households (NPISHs) and general government. The prices underlying the calculation of PPPs adhere to the definitions, concepts, classifications and accounting rules of ESA 2010.

For the purpose of the PPP calculation, the main expenditure aggregates of GDP which are: Individual consumption expenditure by households Individual consumption expenditure by NPISHs Individual consumption expenditure by government Collective consumption expenditure by government Gross fixed capital formation Changes in inventories and acquisitions less disposals of valuables Balance of exports and imports

are broken down into 276 basic headings. The basic heading is the lowest level of aggregation, at which products are sampled and product prices collected. It is the lowest level for which countries should provide numerical expenditure weights. Below the basic heading level are the individual items of the product sample. For example, rice is a basic heading and basmati rice and jasmine rice, are individual products within it.

PPPs are published at the level of 61 analytical categories which comprise aggregates of basic headings and include some of the main expenditure aggregates like GDP, actual individual consumption, household final consumption, collective consumption and gross fixed capital formation.

The classification of commodities and services for households consumption expenditure is conducted in accordance with the Classification of Individual Consumption by Purpose (COICOP). The classification of commodities and services for government consumption expenditure is conducted in accordance with Classification of the Functions of Government COFOG). Total goods, total services and gross fixed capital formation are classified in accordance with Classification of Products by Activity (CPA).

### Sector coverage

PPPs are calculated for GDP and its various sub-aggregates on the expenditure side of national accounts.

### Statistical concepts and definitions

Price level indices: Indicates the domestic price level in relation to the EU average. For example, if the Danish price level index is 126 and the Spanish price level index is 95, it means that the price level in Denmark is 26 pct. higher than the EU average, while the price level in Spain is 5 pct. lower than the EU average.

### Statistical unit

PPPs are calculated for each of the participant countries, for the EU as a whole, and for the euro area. There is no regional breakdown.

### Statistical population

The price level of goods and services in Denmark, compared to other countries in Europe. The statistical population is the expenditure side of the National Accounts, as defined in ESA 2010.

### Reference area

PPP cooperation in Europe includes the 27 EU countries, Iceland, Norway and Switzerland and the candidate countries.

### Time coverage

PPPs are available back to 2000.

### Base period

Not relevant for this statistics, because PPPs are primarily spatial indicators.

### Unit of measure

PPPs can be interpreted as the exchange rates of countries' national currencies against the PPS. They express the number of currency units per PPS.

Real expenditures are expenditures in national currency converted to PPS using PPPs. They are thus denominated in PPS.

PLIs and volume indices per capita are indices that, in Eurostat's database, use EU27 or EU15 as "base country" (EU27=100 or EU15=100, depending on the user's choice).

### Reference period

The reference period is the calendar year.

Annual.

### Legal acts and other agreements

The common rules for the provision of basic information (input data), the calculation and dissemination of PPPs are laid down in Regulation (EC) No 1445/2007 of the European Parliament and of the Council of 11 December 2007.

There is no national legislation governing the preparation of purchasing power parities.

### Cost and burden

The no response burden as all data are collected by the price collectors.

### Comment

More information can be found on the subject page Internatio­nal volume and price comparision.