A measure of the average change in prices paid by consumers for a basket of goods and services over time. CPI is the primary gauge of inflation used by central banks to guide monetary policy decisions.
What CPI Measures
The Consumer Price Index tracks changes in the price level of a weighted basket of consumer goods and services, including food, housing, transportation, medical care, and education. In the U.S., CPI is published monthly by the Bureau of Labor Statistics. Most major economies publish their own CPI data on regular schedules.
CPI and Central Bank Policy
Central banks use CPI as a key input for Interest Rate Differential decisions. When CPI rises above a central bank target (typically 2% for major economies), the bank may raise interest rates to cool inflation, which tends to strengthen the currency. Falling CPI may prompt rate cuts, weakening the currency.
Traders pay close attention to both headline CPI and Core CPI, which strips out volatile food and energy prices for a cleaner trend reading.
Forex Impact
Higher-than-expected CPI is generally bullish for a currency because it increases rate hike expectations. Lower CPI has the opposite effect. Traders often compare CPI across countries to anticipate relative currency strength.
Related Terms
Core CPI
The Consumer Price Index excluding volatile food and energy prices. Core CPI provides a cleaner view of underlying inflation trends and is closely watched by central banks when setting monetary policy.
Producer Price Index (PPI)
A measure of the average change in selling prices received by domestic producers for their output. PPI tracks inflation at the wholesale level and is considered a leading indicator of consumer inflation.
PCE Price Index
The Personal Consumption Expenditures Price Index, the Federal Reserve's preferred inflation measure. PCE covers a broader range of spending than CPI and adjusts for changes in consumer behavior.
Inflation
A sustained increase in the general price level of goods and services, reducing purchasing power. Central banks target specific inflation rates (typically 2%) and adjust monetary policy to achieve that target.
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