Core PCE: the inflation gauge the Fed actually targets

The lesson in plain words

The same lesson as the slides above, written out in full.

1. Core PCE

Welcome. CPI is the inflation number that grabs all the headlines, but here is something many people do not realise. When the Federal Reserve talks about its two per cent inflation target, it is not talking about CPI at all. It means core PCE, the Personal Consumption Expenditures price index, with food and energy stripped out. If you want to anticipate what the Fed will do, this is the number to understand, because it is the one they actually act on. One note before we begin. This is financial education only, not financial advice.

• CPI grabs the headlines, but core PCE is what the Fed targets.
• The Fed's 2% goal is defined in terms of PCE, not CPI.
• The core version strips out volatile food and energy.

A quick note: This is financial education only, not financial advice. Do not buy, sell, or hold anything based on this lesson.

2. How It Differs From CPI

So how does PCE differ from CPI? Three main ways. First, the weights are different. Housing carries a smaller weight in PCE than in CPI, while healthcare carries a larger one. Second, and importantly, PCE allows for substitution. It recognises that when the price of beef soars, people buy more chicken instead, so it does not overstate the pain the way a fixed basket can. Third, PCE has a broader scope, capturing spending made on your behalf, such as the healthcare your employer pays for. Add all that up, and PCE typically runs a little lower than CPI, which is one reason the Fed leans on it.

• PCE uses different weights: housing counts for less, healthcare for more.
• It allows for substitution: when beef gets dear, people buy chicken.
• It has a broader scope, including spending made on your behalf, like employer healthcare.
• As a result, PCE usually runs a little below CPI.

3. Why the Fed Prefers It

Why does the Fed prefer PCE? Because they consider it a more complete and flexible picture of what households actually spend, and how they adjust their behaviour when prices change. That substitution effect matters, because it reflects the real economy rather than a rigid, fixed basket. And crucially, the Fed's official goal, that famous two per cent, is defined in terms of PCE. So core PCE is not just another inflation number, it is the very yardstick against which the central bank measures success or failure, and steers its policy on interest rates.

• The Fed considers PCE a more complete and flexible measure of what people actually spend.
• Its substitution adjustment better reflects real behaviour.
• The official 2% target is defined against PCE, so it is the yardstick for policy.
• Core PCE, ex food and energy, is the trend they steer by.

4. Reading It Against Target

Reading core PCE is a two part exercise. First, read it against the two per cent target. A core PCE running well above two argues for tighter policy, higher for longer rates, while one drifting back toward two gives the Fed room to ease. Second, as with any release, the immediate market move comes from the surprise, the gap between the print and what analysts expected. One useful quirk. PCE arrives later in the month than CPI, so it can either confirm the CPI story or quietly contradict it, which sometimes triggers a fresh move. And as ever, it is the trend, the steady march toward or away from two per cent, that the Fed truly cares about.

• Read core PCE against the 2% target: above it argues for tighter policy.
• As with any release, the market move comes from the surprise versus expectations.
• It arrives later in the month than CPI, so it can confirm or contradict it.
• One reading is a data point; the trend toward or away from 2% is what matters.