Definition and examples of inflation



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DEFINITION AND EXAMPLES OF INFLATION (2)

The Producer Price Index
The producer price index is a family of indexes that measures the average change in selling prices received by domestic producers of intermediate goods and services over time. The PPI measures price changes from the perspective of the seller and differs from the CPI which measures price changes from the perspective of the buyer.7
In all such variants, it is possible that the rise in the price of one component (say oil) cancels out the price decline in another (say wheat) to a certain extent. Overall, each index represents the average weighted price change for the given constituents which may apply at the overall economy, sector, or commodity level.
The Formula for Measuring Inflation
The above-mentioned variants of price indexes can be used to calculate the value of inflation between two particular months (or years). While a lot of ready-made inflation calculators are already available on various financial portals and websites, it is always better to be aware of the underlying methodology to ensure accuracy with a clear understanding of the calculations. Mathematically,
Percent inflation rate = (Final CPI Index Value/Initial CPI Value)*100
Say you wish to know how the purchasing power of $10,000 changed between September 1975 and September 2018. One can find price index data on various portals in a tabular form. From that table, pick up the corresponding CPI figures for the given two months. For September 1975, it was 54.6 (Initial CPI value) and for September 2018, it was 252.439 (Final CPI value).8 Plugging in the formula yields:
Percent inflation rate = (252.439/54.6)*100 = (4.6234)*100 = 462.34%
Since you wish to know how much $10,000 of September 1975 would worth be in September 2018, multiply the percent inflation rate with the amount to get the changed dollar value:
Change in dollar value = 4.6234 * $10,000 = $46,234.25
This means that $10,000 in September 1975 will be worth $46,234.25. Essentially, if you purchased a basket of goods and services (as included in the CPI definition) worth $10,000 in 1975, the same basket would cost you $46,234.25 in September 2018.

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