The GDP deflator is the broadest, most inclusive measure of change in the country’s price level, since it includes all final goods and services produced and sold. But the GDP deflator is not used by the government or economists as the benchmark measure of inflation; instead, the consumer price index (CPI) is used to determine changes in the cost of living. What is the shortcoming of the GDP deflator as a measure of inflation for households, and why is the CPI considered to be a more useful measure?