Purchasing Power
What Is Purchasing Power?
Purchasing power is the value of a currency expressed in terms of the amount of goods or services that one unit of money can buy. It is essentially the "buying power" of your money.
If you had $100 in 1920, you could buy a nice suit, a pair of shoes, and a hat. Today, $100 might buy you one shoe. This erosion of what money can buy is the decline of purchasing power. Purchasing power is the real-world value of money. While a dollar bill always says "$1," its value is not constant. It is defined by the price level of the economy. When prices go up (inflation), the purchasing power of your savings goes down. This is why "stuffing cash under a mattress" is a losing strategy. While the nominal amount stays the same, the real value evaporates. To preserve wealth, you must invest in assets that grow faster than the rate at which purchasing power falls.
Key Takeaways
- It measures what your money can actually buy (real value) vs. the face value (nominal value).
- Inflation erodes purchasing power over time (prices rise, money buys less).
- Deflation increases purchasing power (prices fall, money buys more).
- Central banks aim to keep purchasing power relatively stable (low inflation).
- In trading accounts, "Buying Power" refers to available cash plus margin.
- Investors buy assets (stocks, real estate) to protect purchasing power.
Inflation: The Thief of Purchasing Power
Inflation is the rate at which purchasing power declines. * **2% Inflation:** Your money loses half its value in 35 years. * **5% Inflation:** Your money loses half its value in 14 years. * **Hyperinflation:** Purchasing power can vanish in days or hours (e.g., Zimbabwe, Venezuela). Investors use the Consumer Price Index (CPI) to track changes in purchasing power. If CPI rises by 3%, you need 3% more dollars to buy the same basket of goods.
Purchasing Power in Trading (Buying Power)
In a brokerage account, the term has a slightly different meaning. "Buying Power" or "Purchasing Power" refers to the total amount of stock you can buy, including leverage (margin). * **Cash Account:** Buying Power = Cash Balance. * **Margin Account (Reg T):** Buying Power = Cash × 2 (for overnight) or Cash × 4 (for day trading). If you have $25,000 cash, your Day Trading Buying Power might be $100,000. This allows you to control more shares, but it does not protect you from inflation.
The Bottom Line
Purchasing power is the only metric that matters for long-term wealth. Purchasing power is the measure of financial freedom. Through accounting for the cost of living, it reveals the true return on investment. A 5% return in a year with 6% inflation means you actually lost purchasing power (real return of -1%). Successful investing is about generating "Real Returns"—returns that exceed inflation and grow your ability to consume in the future.
FAQs
Invest in assets that tend to appreciate over time, such as stocks (equities), real estate, or commodities (like gold). Treasury Inflation-Protected Securities (TIPS) are bonds specifically designed to keep up with inflation.
Yes. If prices fall, your dollar buys more. While this sounds good for consumers, widespread deflation is often bad for the economy because it discourages spending (why buy now if it will be cheaper tomorrow?) and increases the real burden of debt.
It is a lighthearted tool created by *The Economist* to compare the purchasing power of different currencies based on the price of a McDonald's Big Mac. It illustrates Purchasing Power Parity (PPP).
Yes, for imports. A strong dollar makes foreign goods (cars, electronics, travel) cheaper for Americans, increasing purchasing power. However, it hurts US exporters because their goods become more expensive for foreigners.
The Bottom Line
Investors looking to retire comfortably must solve the purchasing power equation. Purchasing power is the real value of currency. Through understanding that cash is a melting ice cube, investors are motivated to take risks in the market. The goal of a portfolio is not just to make more dollars, but to make sure those dollars can buy the same lifestyle in 20 years that they can today. It is the fundamental race against inflation.
Related Terms
More in Microeconomics
At a Glance
Key Takeaways
- It measures what your money can actually buy (real value) vs. the face value (nominal value).
- Inflation erodes purchasing power over time (prices rise, money buys less).
- Deflation increases purchasing power (prices fall, money buys more).
- Central banks aim to keep purchasing power relatively stable (low inflation).