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Estimates of Purchasing Power Parity (PPP) provide the key to making meaningful comparisons of prices and incomes between countries. However, the rigorous data requirements and international coordination effort underlying their computation impose restrictions on the frequency of PPP benchmark programmes and the timeliness of published results. Consequently it has been common practice for international statistical agencies in the PPP programme to synthesise annual estimates by interpolating and projecting PPP benchmark data, using estimates of annual price change and real growth from the time-series system of national accounts of member countries.
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