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World Bank on-line data base, Washington DC, 2005.
Uploaded on Wednesday 22 Feb 2012
Gross National Income (GNI) per capita, for the Caspian Sea region countries
Philippe Rekacewicz, UNEP/GRID-Arendal
Purchasing power parity (PPP) measures how much a currency can buy in terms of an international benchmark (usually dollars), since the cost of goods and services differs between countries. PPP is below the value of a US dollar in countries where the general price index is lower than in the US (as is the case for all five Caspian states -Azerbaijan, Iran, Kazakhstan, Russia and Turkmenistan, to varying extents), and above it where the prices are higher.