Common mistakes about inflation

The common belief: any expansion of the money supply mechanically and immediately pushes prices higher.

What the data shows: whether new money raises prices depends on the velocity of money and the state of demand. The Federal Reserve’s balance sheet rose from about $0.9tn in 2008 to $4.5tn by late 2014 (Congressional Research Service), yet core PCE inflation ran at or below the 2% target through most of the 2010s (BEA data). Money created to offset a contraction in credit need not lift prices at all.

→ Full explanation: Does printing money always cause inflation?

The common belief: once inflation peaks and starts falling, the episode is effectively over.

What the data shows: historically, inflation has arrived in successive waves. In the United States, CPI inflation peaked near 12% in late 1974, receded, then peaked near 15% in early 1980 (Federal Reserve History; Dallas Fed), with each trough and peak running higher than the last. A first peak has not been a reliable signal that an episode has ended.

→ Full explanation: Why does inflation come in waves?

The common belief: core inflation, which excludes food and energy, is a statistical trick that hides the prices people actually pay.

What the data shows: core strips out the most volatile components to expose the persistent trend, not to understate the cost of living. In 2022, headline CPI peaked at 9.1% in June while core CPI peaked later and lower, at 6.6% in September (BLS). The gap is precisely the volatile energy and food spike that core is designed to filter out. In Europe that energy spike was largely gas-driven, as detailed in the European gas-driven inflation episode.

→ Full explanation: Core vs headline inflation: what is the difference?

The common belief: if my pay rises during an inflationary period, my purchasing power is preserved.

What the data shows: what matters is real, inflation-adjusted pay. In June 2022, US real average hourly earnings were down 3.6% year over year (BLS) even as nominal wages were rising, because prices climbed faster than pay. A nominal raise can coincide with a real pay cut.

→ Full explanation: Does inflation make you poorer even if your salary rises?

The common belief: an inflation rate of around 2% is too small to affect long-term wealth.

What the data shows: erosion compounds. At a steady 2% rate, the rule of 72 implies purchasing power roughly halves in about 36 years; at 3%, in about 24 years. Across a working life, modest annual rates accumulate into large losses of real value.

→ Full explanation: What is purchasing power and why does it erode silently?

The common belief: inflation is a single phenomenon, usually a temporary demand blip that fades on its own.

What the data shows: cyclical inflation recedes as economic slack returns, but structural inflation tied to energy, demographics or deglobalization responds differently to the same policy. The 1970s combined oil-supply shocks with accommodative monetary policy rather than a single cause (Federal Reserve History), which is part of why the period resisted easy fixes.

→ Full explanation: Structural vs cyclical inflation: how do they differ?

The common belief: the published CPI measures the rising cost of everything, and matches what each household experiences.

What the data shows: CPI tracks a fixed, weighted basket of goods and services, not any one budget. Shelter alone accounts for about one-third of the US index (BLS). A household that spends more on rent or fuel than the basket assumes will experience a rate that diverges from the headline figure.

→ Full explanation: How is CPI actually calculated?

The common belief: CPI and PCE are interchangeable, and the Federal Reserve targets the CPI everyone reads about.

What the data shows: the Fed’s 2% objective is defined on PCE inflation, not CPI. PCE uses different weights and captures substitution between goods, and has historically run a few tenths of a percentage point below CPI over the same period. The same economy can therefore display two different inflation rates depending on the gauge.

→ Full explanation: Why does PCE inflation differ from CPI?

The common belief: rising inflation always signals an overheating economy with too much demand.

What the data shows: inflation can be supply-driven. The San Francisco Fed’s decomposition attributed about half of the 2021-2022 rise in PCE inflation above its pre-pandemic average to supply factors, roughly a third to demand, and the rest to ambiguous causes (Shapiro, FRBSF 2022). Interest-rate increases act mainly on the demand share, which is one reason supply shocks are harder to tame.

→ Full explanation: Supply-driven vs demand-driven inflation

The common belief: when the inflation rate falls, prices are coming down.

What the data shows: disinflation is a slower pace of price increases, where prices still rise. Deflation is an outright decline in the price level. In 2023-2024, US CPI fell from its 9.1% peak toward roughly 3% while prices kept rising (BLS): that is disinflation, not deflation, and the distinction matters for how economies behave.

→ Full explanation: Disinflation vs deflation: what is the difference?

The common belief: inflation is purely mechanical, and what people expect about it is irrelevant.

What the data shows: expected inflation feeds into wage bargaining and price setting, which is why central banks track market-based breakeven rates and survey measures. The IMF has noted that when expectations stay anchored near target, transitory shocks are less likely to entrench, while more backward-looking expectations require firmer tightening (IMF, World Economic Outlook, October 2022).

→ Full explanation: Are inflation expectations self-fulfilling?

The common belief: a country’s own central bank fully controls its inflation rate.

What the data shows: a large share can be imported through exchange rates and global commodity prices. Euro-area HICP inflation peaked at 10.6% in October 2022, with energy the single largest contributor at 4.44 percentage points (Eurostat; ECB), a shock that originated largely outside the bloc’s monetary control.

→ Full explanation: What is imported inflation and how is it transmitted?

The common belief: once wages and prices both start rising, a self-reinforcing spiral is unavoidable.

What the data shows: the IMF examined 22 episodes of high inflation and falling real wages in advanced economies since the 1960s and found sustained wage-price spirals historically rare. In most cases nominal wages gradually caught up while inflation eased, rather than the two ratcheting up together (IMF, World Economic Outlook, October 2022).

→ Full explanation: How does the wage-price spiral work?