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IMF
Clarification to PPP Numbers of the IMF
The GDP number for all reporting areas are one number in the reporting areas
local currency. Therefore, in the local currency the PPP and market (or
government) exchange rate is always 1.0 to its own currency, so the PPP and
market exchange rate GDP number is always per definition the same for any
duration of time, anytime, in that area's currency. The only time the PPP
exchange rate and the market exchange rate can differ is when the GDP number is
converted into another currency.
Only because of different base numbers (because of for example "current" or
"constant" prices, or an annualized or averaged number) are the USD to USD PPP
exchange rate not 1.0, see the IMF data here: [4]. The PPP exchange rate is
1.023 from 1980 to 2002, and the "constant" and "current" price is the same in
2000, because that's the base year for the "constant" (inflation adjusted)
currency.
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