22.5 Indexing and Its Limitations

Indexing and Inflation

Indexing is the practice of automatically adjusting wages, prices, or benefits in response to changes in the price level. It exists to protect people's purchasing power when inflation rises. This section covers how indexing works, where it shows up in government policy, and why it can sometimes backfire.

Indexing Impacts on Inflation

Indexing ties economic variables like wages, interest rates, or government benefits to a measure of inflation (usually the CPI). When prices rise, indexed variables get adjusted upward to compensate.

The core benefit is straightforward: indexing prevents inflation from quietly eating away at your real wages and savings. Cost-of-living adjustments (COLAs), for example, give workers automatic raises that match inflation so their paychecks don't lose value over time.

But indexing has a significant downside. When wages automatically rise with prices, businesses face higher labor costs. They pass those costs on by raising prices further, which triggers another round of wage increases. This feedback loop is called a wage-price spiral, and it can cause inflation to persist or accelerate even after the original cause of inflation is gone.

Government Programs Using Indexing

Several major U.S. government programs use indexing:

• Social Security benefits are adjusted annually based on changes in the Consumer Price Index (CPI). This keeps retirees' and beneficiaries' purchasing power roughly stable from year to year.
• Treasury Inflation-Protected Securities (TIPS) are government bonds whose principal value adjusts with the CPI. If inflation rises 3%, the principal increases by 3%, protecting investors from purchasing power erosion.
• Federal income tax brackets are adjusted annually for inflation using the CPI. Without this adjustment, inflation would push taxpayers into higher brackets even if their real income hadn't changed. This problem is called bracket creep.

Money Supply and Inflation

Excessive Money Supply Growth Fuels Inflation

Inflation is a sustained increase in the general price level over time. One of the most important frameworks for understanding what drives inflation is the quantity theory of money, expressed as:

$MV = PQ$

• $M$ = money supply
• $V$ = velocity of money (how quickly money changes hands in the economy)
• $P$ = price level
• $Q$ = quantity of goods and services produced (real GDP)

The equation tells you that total spending in the economy ($MV$) equals the total value of output ($PQ$). If $V$ and $Q$ are relatively stable, then an increase in $M$ leads directly to an increase in $P$. That's the classic explanation: "too much money chasing too few goods."

Central banks like the Federal Reserve control the money supply through monetary policy tools such as open market operations, reserve requirements, and the discount rate. If the central bank allows the money supply to grow much faster than the economy's output of goods and services, the result is excessive inflation.

High inflation carries real economic costs. It erodes purchasing power, discourages saving and long-term investment, and creates uncertainty that can destabilize the broader economy. This is why central banks typically aim for low, stable inflation rather than zero inflation or unchecked money supply growth.