The economy,
in human terms.
Prices and paychecks, from the supermarket to the rent.
The CPI energy index combines fuels that households buy for different purposes and whose prices move on separate paths. Its September increase was led by gasoline, while electricity rose slightly and piped gas fell.
Gasoline’s share of household spending lets a sharp pump-price swing move the overall CPI, even while other prices barely change. The index records the retail price consumers pay, while crude oil, refining, distribution and taxes help explain how that price is formed.
Grocery and restaurant prices follow different paths because they cover different purchases and costs. The CPI separates them, and its September 2026 figures show why one food average can conceal the split—and why neither measure exactly matches a household’s own bill.
A national CPI tracks price changes across a representative urban household basket. A household that spends more on fast-rising categories can face a sharper personal increase, while one with different purchases may feel less pressure.
A price decline in one category can offer relief without lowering the overall cost of the consumer basket. Deflation means prices fall broadly; disinflation means they continue rising more slowly. September’s CPI shows the distinction in practice.
Inflation is a broad rise in consumer prices over time; deflation is a broad decline. A lower price for one item, or a slowdown in inflation, does not by itself mean the overall price level is falling.
When income changes slowly but bills adjust at different speeds, a price increase can force immediate tradeoffs. Inflation indexes describe average price movements; household budgets show how timing, spending patterns and flexibility shape the pressure.
Compare the change in pay with the change in a consumer price index over the same period. Then check hours worked: hourly purchasing power and total weekly earnings answer different questions.
When prices rise and pay stays fixed, the same dollars cover fewer purchases. The impact depends on which costs rise and how closely a household’s spending matches the average basket used to measure inflation.
The CPI tracks price changes for a representative basket, not the precise cost of preserving every household’s standard of living. Changing needs, spending patterns and public conditions explain the difference.
A price index tracks changes in a representative basket of consumer purchases. A full measure of the cost of maintaining well-being would also have to account for public services, environmental conditions and differences among households.
CPI shelter measures changes in housing services, including rent and an estimated rental value for owner-occupied homes. That makes the index useful for tracking consumption costs, but different from home prices, mortgage bills or any one household’s experience.
The CPI tracks prices for consumer goods and services across eight broad groups. Its boundaries include purchase-linked sales and excise taxes but exclude income taxes and investments, so the index does not mirror every household’s budget.
Inflation measures track price changes across a weighted basket, while household budgets differ in what they buy. September’s national figures show why a broad average can rise differently from an individual’s costs.
Core inflation filters out food and energy to make underlying price patterns easier to see. Headline inflation still matters because households buy groceries and fuel, and the two measures answer different questions.
CPI and PCE track consumer prices through different scopes and methods. Their September 2026 readings differed, but neither index describes every household’s personal inflation experience.
A base period sets an index to 100 so later levels can show relative price movement. Percent changes, calculated against the earlier index level, make comparisons meaningful across items and time.
Disinflation is a slowdown in the rate of price increases, not a return to earlier prices. A hypothetical grocery item shows how inflation, disinflation and deflation differ, while September’s CPI illustrates how a national average can move differently from individual bills.
