Personal Consumption Expenditures Price Index

The Personal Consumption Expenditures (PCE) price index is the Federal Reserve’s preferred measure of consumer inflation. It is derived from the national accounts and covers a broader basket of goods and services than the Consumer Price Index, including items not typically surveyed by CPI such as hospital services and imputed housing services.

Why the Fed prefers PCE

The Federal Reserve uses core PCE rather than CPI for several reasons:

1. Broader coverage. Includes healthcare, imputed housing, and other items not directly surveyed in CPI.
2. Chain-weighted. Accounts for substitution — when beef prices spike, consumers shift to chicken, and the weighting reflects that shift.
3. Quality adjustment. Better accounts for quality improvements in products over time.
4. Consistency with national accounts. PCE comes from the GDP accounting, so it integrates well with other economic data.

The Fed’s 2% inflation target applies to core PCE.

PCE versus CPI

Both measure consumer-price inflation, but they differ:

Typically, core PCE and core CPI track closely (within 0.2–0.3 percentage points). Headline PCE and CPI diverge more due to energy/food volatility.

Chain-weighting explained

PCE uses “chain-weighting,” comparing each period’s prices to the immediately prior period’s prices and consumption patterns:

• Fixed-weight CPI: 2023 basket = 100. All 2024 items valued at 2023 prices, then inflation calculated. This makes substitution effects lag.
• Chain-weighted PCE: Each month’s inflation is relative to prior month’s prices and spending. These growth rates chain together to create an index. Substitution is captured in real-time.

In periods of large relative price shifts (energy booms, food spikes), chain-weighting produces noticeably lower inflation than fixed-weight CPI.

Healthcare in PCE

Healthcare is weighted heavier in PCE than CPI because national accounts track all healthcare spending, including government coverage (Medicare, Medicaid). CPI captures what households out-of-pocket pay, which is a smaller share. In PCE, healthcare can be 15%+ of the index, making it highly influential.

Core PCE

The Fed targets core PCE (excluding food and energy):

• Headline PCE = All items (volatile due to oil/food shocks)
• Core PCE = Excluding food and energy (smoother; isolates underlying demand-driven inflation)

When headline PCE spikes from an oil shock but core PCE is stable, the Fed interprets this as a temporary external shock, not sustained inflation.

PCE and monetary policy

The Federal Reserve adjusts interest rates based partly on PCE:

• If core PCE > 2.5%: Inflation above target; Fed tightens.
• If core PCE = 2.0%: Inflation at target; Fed holds steady.
• If core PCE < 1.5%: Inflation below target; Fed may ease.

The lag in PCE reporting (comes out with monthly national accounts data, ~30 days after month-end) means monetary policy lags a bit. CPI, released earlier, often moves markets first.

PCE and real returns

For investors, core PCE is important for understanding real returns:

Real return = Nominal return − PCE inflation

A 4% bond yield in an environment of 2.5% core PCE inflation yields 1.5% in real terms. This drives asset allocation: rising PCE reduces real returns, making stocks less attractive relative to bonds.

Relationship to GDP deflator

The PCE price index and GDP deflator are closely related:

• PCE index: Consumption spending inflation.
• GDP deflator: All output prices (consumption + investment + government + net exports).

The GDP deflator is usually 0.1–0.3 points higher than headline PCE because investment goods prices can diverge from consumption prices.

See also