Learn · Economy & central banks

What Is Inflation? How to Read CPI and PCE Data

Why inflation data causes sharp market volatility, how CPI and PCE differ, and what Core means

Updated 2 Oct 2026 · Translated by AI

Inflation is a sustained rise in the overall prices of goods and services, so the same amount of money buys less. A small amount of inflation is normal for a growing economy, but if it gets too high, the central bank has to raise interest rates to slow it down.

Key US Inflation Measures

MeasureCompiled byReleaseHighlights
CPI (Consumer Price Index)BLS, Department of LaborMonthly, mid-month at 8:30 a.m. New York timeThe most closely watched by the market because it is released first
PCE Price IndexBEA, Department of CommerceMonthly, late in the monthUsed by the Fed for its 2% inflation target
PPI (Producer Price Index)BLSMonthlyPrices on the producer side, which may be passed on to consumers

How Headline and Core Differ

  • Headline includes all categories, including food and energy, whose prices are volatile
  • Core excludes food and energy to show the underlying trend of inflation. The Fed and the market usually give Core more weight

How to Read the Numbers

Each release comes in two forms:

  1. Month-over-month (MoM) shows the latest momentum
  2. Year-over-year (YoY) is the headline figure in the news, used for comparison with the 2% target

What the market looks at is the actual figure versus the analyst forecast (Consensus)

ResultMeaningTypical reaction
Higher than expectedThe Fed may keep rates high for longer or keep raising themThe dollar strengthens; gold and stocks come under pressure
Lower than expectedThe Fed has room to cut ratesThe dollar weakens; gold and stocks get a boost

On CPI release days, gold prices, the dollar and stock index futures often swing sharply within a few minutes. In Thai time, this is around 19:30 (US summer time) or 20:30 (US winter time).

Thailand's Inflation

Thailand uses a consumer price index compiled by the Ministry of Commerce, and the Bank of Thailand (BOT) sets a headline inflation target of 1–3%. Read more: Major Central Banks of the World

For education only, not investment advice. Figures change over time, so check official sources before making decisions.