INFLATION-is a rise in the general level of prices over time. It may also refer to a rise in the prices of a specific set of goods or services.

DEFLATION-is the opposite of inflation, therefore deflation means a decrease in the general price level

STAGFLATION-is a macroeconomics term used to describe a period of inflation combined with stagflation (slow economic growth and rising unemployment, possibly including recession)

2) I'm surprised to see that the CPI measures almost every kind of products consume by the people in the U.S