Consumer Price Index

Stagflation
A condition of slow economic growth and relatively high unemployment - a time of stagnation - accompanied by a rise in prices, or inflation.

Stagflation occurs when the economy isn't growing but prices are, which is not a good situation for a country to be in. This happened to a great extent during the 1970s, when world oil prices rose dramatically, fueling sharp inflation in developed countries. For these countries, including the U.S., stagnation increased the inflationary effects.


A general decline in prices, often caused by a reduction in the supply of money or credit. Deflation can be caused also by a decrease in government, personal or investment spending. The opposite of inflation, deflation has the side effect of increased unemployment since there is a lower level of demand in the economy, which can lead to an economic depression.

Declining prices, if they persist, generally create a vicious spiral of negatives such as falling profits, closing factories, shrinking employment and incomes, and increasing defaults on loans by companies and individuals. To counter deflation, the Federal Reserve (the Fed) can use monetary policy to increase the money supply and deliberately induce rising prices, causing inflation. Rising prices provide an essential lubricant for any sustained recovery because businesses increase profits and take some of the depressive pressures off wages and debtors of every kind.


Inflation
The rate at which the general level of prices for goods and services is rising, and, subsequently, purchasing power is falling.

As inflation rises, every dollar will buy a smaller percentage of a good. For example, if the inflation rate is 2%, then a $1 pack of gum will cost $1.02 in a year. Most countries' central banks will try to sustain an inflation rate of 2-3%.
How is the CPI calculated?
The CPI is a product of a series of interrelated samples. First, using data from the 1990 Census of Population, BLS selected the urban areas from which data on prices were collected and chose the housing units within each area that were eligible for use in the shelter component of the CPI. The Census of Population also provided data on the number of consumers represented by each area selected as a CPI price collection area. Next, another sample (of about 16,800 families each year) served as the basis for a Point-of-Purchase Survey that identified the places where households purchase various types of goods and services.