Her expertise is in personal finance and investing, and real estate. The Producer Price Index (PPI) measures the average change over time in the prices domestic producers receive for their output.

Tom Werner / Getty Images The Consumer Price Index (CPI) is considered one of the most fundamental and critically important economic indicators used to measure inflation. A CPI is used not only in ...

"According to the formula, COLAs are based on increases in the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W)," the website states. The CPI, as a proxy for inflation ...