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Foundations

Inflation, deflation & purchasing power

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Inflation, deflation & purchasing power

Money's most fragile function is as a store of value. You earn $100 today and want to spend $100 worth of goods tomorrow. But if prices rise overnight, your $100 buys less. This is inflation—and it's not just an abstract economic concept. It's what happens in your wallet when the purchasing power of money falls.

Inflation is everywhere. Mild inflation occurs in almost every modern economy. Moderate inflation damages savings and long-term planning. Extreme inflation (hyperinflation) can destroy an entire currency's ability to function. Yet many people don't truly understand what inflation is, how it happens, or why it matters beyond "things cost more."

This chapter moves you from intuition to understanding. You'll learn what inflation is at a mechanical level—how it relates to money supply, price levels, and time. You'll see how inflation damages the store-of-value function while often leaving the medium-of-exchange and unit-of-account functions intact. You'll explore deflation, its mirror image, which creates different but equally serious problems. And you'll understand purchasing power—the concept that $100 is only meaningful if you know what it can buy.

Why this matters​

Inflation touches everything. It affects how much your savings are actually worth. It determines how much real value you build through work. It shapes government policy, central bank decisions, and interest rates. It explains why someone who loaned you $1,000 ten years ago doesn't necessarily think you've fully repaid them. It's why old stories of people earning "good money" can mislead—you need to know what that money actually bought.

More fundamentally, inflation challenges money's core promise: that it stores value across time. When inflation is predictable and low, people adjust. When it's erratic or high, they stop trusting money as a store of value. They rush to convert it into goods, real estate, or foreign currencies. This is how moderate inflation can accelerate into crisis.

What you'll learn​

This chapter answers specific questions. How is inflation measured? What causes it? What's the difference between inflation and rising prices? Why does inflation vary so much between countries and time periods? What happens in a deflationary economy? How do real interest rates relate to inflation? And how do you interpret financial stories when inflation is involved?

You'll encounter the mechanics of how central banks create money, how that relates to inflation, and how inflation expectations shape economic behavior. You'll examine different inflation regimes—from low, stable inflation in developed economies to the hyperinflation episodes that destroy currencies. You'll learn why "beating inflation" through investment is important, but only after you understand what inflation actually is doing to you.

How to read this chapter​

This chapter builds sequentially. The early articles establish what inflation is mechanically—how prices, money supply, and time interact. The middle sections zoom out to show how inflation occurs across different economic systems and what causes different inflation rates. Later articles address what inflation means for you personally: how to interpret numbers, what inflation does to debt and savings, and how to think about long-term financial decisions when inflation is always present.

By the end of this chapter, when you hear "inflation is 3%," you'll know what that actually means, what caused it, whether it's concerning, and how it affects your financial life. That understanding is the foundation for every decision chapter that follows.

Articles in this chapter​