What it means
Purchasing power is a measure of what your money is actually worth in the shops rather than what the number on the note says. A $100 bill that bought a full trolley of groceries ten years ago may buy noticeably less today if prices have climbed.
The face value has not changed, but its real value has. Inflation (a general rise in prices across an economy) is the main force that erodes purchasing power.
If average prices rise by 4% in a year, then money held in cash buys about 4% less at the end of that year than at the start. That is why savers look for returns that beat inflation rather than simply protecting the number in their account.
In business, purchasing power matters in several ways. Wage negotiations often refer to it, because employees want pay rises that at least match price increases.
Pricing teams watch it too, since customers whose purchasing power is shrinking tend to trade down or delay purchases. The term also applies between currencies.
Purchasing power parity is the idea that, in the long run, exchange rates should adjust so that the same basket of goods costs about the same in each country when measured in a common currency. In practice, rates drift away from this for long stretches, but it remains a useful benchmark for comparing living costs and incomes across borders.
Analysts convert nominal figures (the raw numbers) into real figures (adjusted for inflation) to see purchasing power clearly. Real wages, real revenue and real returns all use this adjustment.
Without it, a business could report rising sales that are really just higher prices on the same volume of goods. A nuance worth remembering is that there is no single inflation rate for everyone.
A family spending heavily on rent and food may feel a bigger drop in purchasing power than a household whose spending is mostly on goods that have become cheaper. The published price index is an average, and individual experience can differ from it.
In practice
Real-world examples.
Example
A retail chain notices that sales volumes are flat even though its revenue is up 6%. Prices rose by about 6% over the same period, so in real terms the business sold the same amount. The finance team reports growth in real terms alongside the headline number so the board is not misled.
Example
A software firm hires staff in two countries and wants to compare pay fairly. It adjusts both salary scales for local living costs, so that a developer in a lower-cost city has similar purchasing power to one in a higher-cost city. The adjustment reduces resentment about pay differences.
Example
A pension fund manager is projecting what a retiree's fixed income of $30,000 a year will buy in 20 years. With average inflation of 3%, the purchasing power of that income falls substantially, so the manager recommends including investments that tend to grow with prices.
Formula
Calculation
Real purchasing power = nominal amount / (1 + cumulative inflation rate)
Suppose an employee earns $50,000 and receives no pay rise for several years, during which prices rise by a cumulative 25%. In terms of the original year's prices, the salary is now worth 50,000 / 1.25 = $40,000. The employee has therefore lost 50,000 - 40,000 = $10,000 of purchasing power, or 20% of the original value. To restore the original purchasing power, the salary would have to rise to 50,000 x 1.25 = $62,500.Case study
Seen in the real world.
Brightwater Bakeries is an illustrative, fictional chain of 15 bakeries that kept its prices unchanged for two years because the owners feared losing customers. Revenue stayed at $4,000,000 a year, and the owners felt the business was stable. Meanwhile, flour, energy and wage costs rose by about 15% over the same period.
The new finance manager restated the results in real terms. Revenue measured against the cost of inputs had fallen, and profit margin had shrunk from 12% to 5%. The business was not growing at all; its purchasing power against suppliers and staff was eroding.
The owners introduced small, regular price increases of around 3% a year and explained them openly to customers. Sales volumes dipped slightly at first and then recovered. The illustrative lesson is that standing still in nominal terms means going backwards in real terms.
Watch out
Common mistakes.
- Assuming that a pay rise is a real gain without comparing it to the rate of price increases over the same period.
- Judging revenue growth by the headline figure and ignoring that part of it may simply reflect higher prices rather than more sales.
- Treating the official inflation rate as the personal inflation rate for every household or business, when individual spending patterns can differ widely.
Questions
People also ask.
Does a stronger currency mean higher purchasing power?
A stronger currency generally lets you buy more imported goods, but your overall purchasing power also depends on domestic prices, so the two can move differently.
How do I protect purchasing power?
People commonly aim for returns that exceed the rate of inflation, for example through investments or contracts with built-in price adjustments, although no approach is guaranteed.
What is the difference between nominal and real values?
Nominal values are the raw figures at the time, while real values are adjusted for inflation so that different years can be compared fairly.
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