El poder adquisitivo está determinado por una cantidad de bienes y servicios que pueden ser comprados con una suma específica de dinero, dados los precios de estos bienes y servicios. Así, cuanto mayor sea la cantidad de bienes y servicios que pueden ser adquiridos con determinada suma de dinero, mayor será el poder adquisitivo de dicha moneda. Por ello, la medición del poder adquisitivo está directamente relacionado con el índice de precios al consumidor y puede ser usado para comparar la riqueza de un individuo promedio para un período anterior al presente o en diferentes países en una misma época. Como notó Adam Smith, poseer dinero otorga la habilidad de «tener el mando» del trabajo de otros, por lo que el poder adquisitivo puede convertirse en poder sobre otras personas, en tanto estas estén dispuestas a negociar su trabajo o bienes por dinero.

Leer el artículo completo en Wikipedia · CC-BY-SA

Purchasing power (sometimes retroactively called adjusted for inflation) is the number of goods or services that can be purchased with a unit of currency. For example, if one had taken one unit of currency to a store in the 1950s, it is probable that it would have been possible to buy a greater number of items than would today, indicating that one would have had a greater purchasing power in the 1950s. Currency can be either a commodity money, like gold or silver, or fiat money emitted by government sanctioned agencies. Traditionally, the purchasing power of money depended heavily upon the local value of gold and silver, but was also made subject to the availability and demand of certain goods on the market. Most modern fiat currencies like US dollars are traded against each other and commodity money in the secondary market for the purpose of international transfer of payment for goods and services. As Adam Smith noted, having money gives one the ability to "command" others' labor, so purchasing power to some extent is power over other people, to the extent that they are willing to trade their labor or goods for money or currency. If one's monetary income stays the same, but the price level increases, the purchasing power of that income falls. Inflation does not always imply falling purchasing power of one's money income since it may rise faster than the price level. A higher real income means a higher purchasing power since real income refers to the income adjusted for inflation. For a price index, its value in the base year is usually normalized to a value of 100. The purchasing power of a unit of currency, say a dollar, in a given year, expressed in dollars of the base year, is 100/P, where P is the price index in that year. So, by definition the purchasing power of a dollar decreases as the price level rises.The purchasing power in today's money of an amount C of money, t years into the future, can be computed with the formula for the present value: where in this case i is an assumed future annual inflation rate. Adam Smith used an hour's labour as the purchasing power unit, so value would be measured in hours of labour required to produce a given quantity (or to produce some other good worth an amount sufficient to purchase the same).

Leer el artículo completo en Wikipedia · CC-BY-SA