What index is used to measure the average prices paid by a typical family? an average of the prices of the goods and services purchased by a typical family is the: a. aggregate price level index. b. consumer price index (cpi). c. producer price index (ppi). d. inflation rate index. suppose the economy's consumer price index (cpi) in 2008 was 185 and the cpi in 2009 was 197. the inflation rate over the period from 2008-2009 was equal to nothing%. (enter your response rounded to one decimal place.)