Purchasing power, all you want to know about it.
Understanding Purchasing Power and the Consumer Price Index
What Is Purchasing Power?
Purchasing power is the value of a currency expressed in terms of the number of goods or services that one unit of money can buy. It can weaken over time due to inflation. That’s because rising prices effectively decrease the number of goods or services you can buy. Purchasing power is also known as a currency’s buying power.
In investment terms, purchasing or buying power is the dollar amount of credit available to a customer based on the existing marginable securities in the customer’s brokerage account.
KEY TAKEAWAYS
- Purchasing power is the amount of goods or services that a unit of currency can buy at a given point in time.
- Inflation erodes the purchasing power of a currency over time.
- Central banks adjust interest rates to try to keep prices stable and maintain purchasing power.
- One U.S. measure of purchasing power is the Consumer Price Index (CPI).
- Globalization has linked currencies more closely than ever so protecting purchasing power worldwide is crucial.
Understanding Purchasing Power
Inflation reduces a currency’s purchasing power and what that currency can buy. Loss of purchasing power has the effect of an increase in prices. To measure purchasing power in the traditional economic sense, you could compare the price of a good or service against a price index such as the Consumer Price Index (CPI).
One way to think about purchasing power is to imagine that you made the same salary that your grandfather made 40 years ago. Today, you would need a much greater salary to maintain the same quality of living.
By the same token, a homebuyer looking for homes 10 years ago in the $300,000 to $350,000 price range had more and better options to consider than people have now in the same price range.
Purchasing power affects every aspect of economics, from consumers buying goods to investors buying stock to a country’s economic prosperity.
When a currency’s purchasing power decreases due to excessive inflation, serious negative economic consequences can arise. These can include a higher cost of living, higher interest rates that affect the global market, and falling credit ratings. All of these factors can contribute to an economic crisis.
Purchasing Power and CPI
Governments institute policies and regulations to protect a currency’s purchasing power and keep an economy healthy. They also monitor economic data to stay on top of changing conditions. For example, the U.S. Bureau of Labor Statistics (BLS) measures price changes and announces those changes with CPI.
CPI is one of the measures of inflation and purchasing power. It calculates the change in the weighted average of prices of consumer goods and services, and in particular, transportation, food, and medical care, at a given time. CPI can point to changes in the cost of living as well as deflation.
The CPI is just one official measure of purchasing power in the U.S.
Purchasing Price Parity
A concept related to purchasing power is purchasing price parity (PPP). PPP is an economic theory that estimates the amount by which an item should be adjusted for parity, given two countries’ exchange rates. PPP can be used to compare countries’ economic activity, income levels, and other relevant data concerning the cost of living, or possible rates of inflation and deflation.
The World Bank’s International Comparison Program releases data on purchasing power parities between different countries.1
Purchasing Power Loss or Gain
Purchasing power loss or gain refers to the decrease or increase in how much consumers can buy with a given amount of money. Consumers lose purchasing power when prices increase. They gain purchasing power when prices decrease.
Causes of purchasing power loss can include government regulations, inflation, and natural and human-made disasters. Causes of purchasing power gain include deflation and technological innovation.
One example of purchasing power gain would be if laptop computers that cost $1,000 two years ago cost $500 today. In the absence of inflation, $1,000 will now buy a laptop plus an additional $500 worth of goods.
The Great Inflation of the 1970s to early 1980s devastated the purchasing power and standard of living of Americans. The rate of inflation skyrocketed to 14%.
Examples of Purchasing Power
Germany After WWI
Historical examples of severe inflation and hyperinflation (which can destroy a currency’s purchasing power) can show us the various causes and effects of such phenomena. Sometimes, expensive and devastating wars will cause an economic collapse, in particular for the losing country. This happened to Germany after World War I (WWI).
In the aftermath of WWI during the 1920s, Germany experienced extreme economic hardship and almost unprecedented hyperinflation, due in part to the enormous amount of reparations Germany had to pay.
Unable to pay these reparations with the suspect German mark, Germany printed paper notes to buy foreign currencies, resulting in high inflation rates that rendered the German mark valueless with a nonexistent purchasing power.
The 2008 Financial Crisis
The effects of the loss of purchasing power in the aftermaths of the 2008 global financial crisis and the European sovereign debt crisis are remembered to this day. Due to increased globalization and the introduction of the euro, currencies are inextricably linked and economic trouble can cross geographic boundaries. As a result, governments worldwide institute policies to control inflation, protect purchasing power, and prevent recessions.
For example, in 2008 the U.S. Federal Reserve kept interest rates near zero and instituted a plan called quantitative easing (QE). Quantitative easing, initially controversial, saw the U.S. Federal Reserve System (Fed) buy government and other market securities to increase the money supply and lower interest rates.
The increase in capital spurred increased lending and created more liquidity. The U.S. stopped its policy of quantitative easing once the economy stabilized.
The European Central Bank (ECB) also pursued quantitative easing to help stop deflation in the eurozone after the European sovereign debt crisis and bolster the euro’s purchasing power.
The European Economic and Monetary Union established strict regulations in the eurozone related to accurately reporting sovereign debt, inflation, and other financial data. As a general rule, countries attempt to keep inflation fixed at a rate of 2 percent. Moderate levels of inflation are acceptable. High levels of deflation can lead to economic stagnation.
Special Considerations
Investments That Protect Against Purchasing Power Risk
Retirees can be particularly aware of purchasing power loss since many of them live off of a fixed amount of money. They must make sure that their investments earn a rate of return equal to or greater than the rate of inflation so that the value of their nest egg does not decrease each year.
Debt securities and investments with fixed rates of returns are the most susceptible to purchasing power risk or inflation. Fixed annuities, certificates of deposit (CDs), and Treasury bonds all fall into this category. For instance, a long-term bond with a low fixed rate of return might fail to increase your investment during periods of inflation.
Some investments or investing strategies can help protect investors against purchasing power risk. For example, Treasury inflation-protected securities (TIPS) adjust to keep up with rising prices. Commodities such as oil and metals may maintain pricing power during periods of inflation.
What’s Purchasing Power?
Purchasing power refers to how much you can buy with your money. As prices rise, your money can buy less. As prices drop, your money can buy more.
How Does Inflation Erode Purchasing Power?
Inflation is the gradual rise in the prices of a broad range of products and services. If inflation persists at a high level or gets out-of-control, it can eat away your purchasing power—what you can buy with the money you have. The same product that cost $2 six months ago might now cost $4, due to inflation. This rise in prices in turn can erode people’s savings and consequently, their standard of living.
What Is the Consumer Price Index?
The CPI measures the prices of certain consumer goods and services over time to discern changes in prices that indicate inflation. The prices for those goods and services are obtained from American consumers by way of the Consumer Expenditure Survey conducted by the Census Bureau for the Bureau of Labor Statistics (which publishes the CPI).
The Bottom Line
Long-time investors know that loss of purchasing power can greatly impact their investments. Rising inflation affects purchasing power by decreasing the number of goods or services you can purchase with your money.
Investors must look for ways to make a return higher than the current rate of inflation. More advanced investors may track international economies for the potential effect on their long-term investments.
Money and Purchasing Power
How to increase your purchasing power?
Purchasing Power – Real Economy: Crash Course
Purchasing power is the amount of goods and 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 would have been possible to buy a greater number of items than would be the case today, indicating that the currency had a greater purchasing power in the 1950s.
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 the latter 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.
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.
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.
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).
EUROSTAT defines purchasing power standard (PPS) as an artificial currency unit.
Fisher, Irving (1867–1947)
W.J. Barber, in International Encyclopedia of the Social & Behavioral Sciences, 2001
3 Early Work in Monetary Theory
The Purchasing Power of Money (1911) was conceived as an exercise in establishing the validity and usefulness of the quantity theory of money, a doctrine that had been politically contaminated in the polemics over ‘free silver’ in the 1890s. In Fisher’s formulation, ‘the equation of exchange’ was written as MV+M′ V′=PT.
(In this expression, M represented the quantity of cash and V the velocity of its circulation; M′ stood for total deposits subject to check and V′ for the average velocity of their circulation; P was defined as an average price and T as the volume of trade.)
This book was a vigorously monetarist document in which Fisher maintained that changes in the general price level were linked to proportionate changes in the money supply. This was true in the ‘normal period,’ defined as a state of equilibrium in which the values of T and the V‘s were constant. His choice of terminology on this point bred misunderstandings: he recognized readily that economic reality was typified by ‘transition periods’—when adjustments to disturbances were being worked out—in which the constancies did not hold.
Fisher was not content to offer solely an analytic explanation for variations in the purchasing power of money. Convinced as he was that monetary instability produced distributive injustices by distorting the relative positions of creditors and debtors, he felt obliged to suggest a corrective.
His proposed remedy prescribed that changes in the general price level should be offset by variations in the gold content of the dollar (i.e., the ‘compensated dollar’ plan). But this policy recommendation did not mesh with the analysis presented in The Purchasing Power of Money.
The ‘compensated dollar’ scheme rested essentially on a ‘commodity theory of money’ in which the real value of money was determined by the value of its gold equivalent. This conclusion did not follow from the ‘equation of exchange’ that Fisher had set out as the basis for his ‘quantity theory of money.’ Schumpeter (1948) and Patinkin (1993) have suggested that this oddity can be explained because Fisher, the reformer, got the better of Fisher, the scholar.
Purchasing Power
Opportunities to multiply purchasing power affords libraries a great opportunity to level the playing field and, in many instances, shift the negotiation in their favor. Vendors are in business to make money. Providing an opportunity for them to increase overall sales is a great way to reduce the cost for individual libraries.
A library that belongs to a consortium or some other group can use this as way to gain concessions in exchange for advocating for a joint purchase. This can be especially effective if the library is well regarded in the consortium or is the flagship campus of a university system.
Vendors will also use the purchasing power of libraries to their advantage by offering exclusive deals to such groups. The hope here is that libraries will be more motivated to purchase something due to a couple of reasons.
First, the deal is “too good to pass up” and the libraries do not want to miss the opportunity to add something to their collection at a discounted price. Second, there is pressure as other libraries will be unable to take advantage of the offer if there is not a minimum number of libraries participating.