Purchasing power parity

Definition and stakes

Portrait of John Maynard Keynes John Maynard Keynes,  A Tract on Monetary Reform

“ When it is not so restricted, the conception of purchasing power parity becomes much more interesting, but is no longer an accurate forecaster of the course of the foreign exchanges. If, therefore, we follow the ordinary practice of fixing purchasing power parity by comparisons of the general purchasing power of a country’s currency at home and abroad, then we must not infer from this that the actual rate of exchange ought to stand at the purchasing power parity, or that it is only a matter of time and adjustment before the two will return to equality. ”
Source: Gutenberg

Portrait of Irving Fisher Irving Fisher,  The Purchasing Power of Money…

“ With higher interest, the value of land, railroads, and other durable capital will be lower because the value depends on future earnings or future services, and these are now discounted at a higher rate.*36 The borrower, in paying back an equal purchasing power over consumable goods and services, is paying back a much higher purchasing power over such things as land, houses, and factories—a much higher purchasing power over future income—than he borrowed. ”
Source: Wikisource

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