CPI assesses changes in the cost of living by measuring changes consumer pay for a set of items. CPI serves as the headline figure for inflation. Simply put, inflation reflects a decline in the purchasing power of the dollar, where each dollar buys fewer goods and services. In terms of measuring inflation, CPI is the most obvious way to quantify changes in purchasing power. The report tracks changes in the price of a basket of goods and services that a typical American household might purchase. An increase in the Consumer Price Index indicates that it takes more dollars to purchase the same set basket of basic consumer items.

Inflation is generally bad news for the economy, causing instability, uncertainty and hardship. To address inflation, the Fed may raise interest rates. However, the Fed relies on the PCE Deflator as its primary gauge of inflation because the CPI does not account for the ability of consumer to substitute out of CPI's set. Price changes tend to cause consumers to switch from buying one good to a less expensive-other, a tendency that the fixed-basket CPI figure does not yet account for. Given that the PCE Deflator is a more comprehensive calculation, based on changes in consumption; it is the figure the Fed prefers.

The figure is released monthly, as either a month over month annualized percentage change, or percentage change for the full year. The figure is seasonally adjusted to account seasonal consumption patterns.Inflation is generally bad news for the economy, causing instability, uncertainty and hardship. To address inflation, the Fed may raise interest rates. However, the Fed relies on the PCE Deflator as its primary gauge of inflation because the CPI does not account for the ability of consumer to substitute out of CPI's set. Price changes tend to cause consumers to switch from buying one good to a less expensive-other, a tendency that the fixed-basket CPI figure does not yet account for. Given that the PCE Deflator is a more comprehensive calculation, based on changes in consumption; it is the figure the Fed prefers.

The figure is released monthly, as either a month over month annualized percentage change, or percentage change for the full year. The figure is seasonally adjusted to account seasonal consumption patterns.

In the United Kingdom, the Retail Prices Index or Retail Price Index (RPI) is a measure of inflation published monthly by the Office for National Statistics.

A monthly survey that measures change in input prices as incurred by UK manufacturers. Input prices include the cost of materials used plus operation costs of running the business. The index can be used as a measure of inflation, given that higher input costs will likely be passed on from producers to consumers in the form of higher retail prices.

The headline is the percentage change in the Producer Price Index (Input) from the previous quarter and previous year.

CPI is the key gauge for inflation in the Eurozone. Inflation, simply put, is a decline in the purchasing power of the Euro, where each Euro buys fewer goods and services due to higher consumer prices. The index tracks changes in the price of a basket of goods and services that a typical household might purchase. When the CPI is high, it indicates that significant inflationary pressures exist in Eurozone economies. This puts pressure on the European Central Bank to raise interest rates. When CPI comes out lower than expected, the ECB is expected to lower interest rates, or keep them lower, to encourage economic growth. As a rule, the Bank adjusts rates in order to keep Europe consumer price inflation in the 0 to 2 percent range.

CPI Excluding Core Eight

The Consumer Price Index excluding eight items which the Bank of Canada has deemed to have the most volatility from month to month. The goods omitted tend to fluctuate idiosyncratically and may distort CPI data. The headline figure for CPI is the percentage change in the index on a month to month and year to year basis.

Note : These Eight items include: fruit, vegetables, gasoline, fuel oil, natural gas, mortgage interest, inter-city transportation and tobacco products. Changes in the CPI Excluding the Core 8 are recognized as a better indicator of inflation than the regular CPI. The headline figure is reported as a percent change on both the month to month and year to year basis.