The index for gasoline was by far the largest contributor to the monthly all items decrease, more than offsetting increases in shelter indexes. The food index increased 0.3 percent over the month with the food at home index rising 0.2 percent. The energy index decreased 4.5 percent over the month as the gasoline index declined; other major energy component indexes increased over the month.

The index for all items less food and energy rose 0.3 percent in December, after rising 0.2 percent in November. Indexes which increased in December include the shelter, household furnishings and operations, motor vehicle insurance, recreation, and apparel indexes. The indexes for used cars and trucks, and airline fares were among those that decreased over the month.

The all items index increased 6.5 percent for the 12 months ending December; this was the smallest 12-month increase since the period ending October 2021. The all items less food and energy index rose 5.7 percent over the last 12 months. The energy index increased 7.3 percent for the 12 months ending December, and the food index increased 10.4 percent over the last year; all of these increases were smaller than for the 12-month period ending November.

A measure of the average change in prices over time for a set group of goods and services. The Bureau of Labor Statistics publishes CPIs for two population groups:

• (1) for all urban consumers (CPI-U) which covers approximately 80 percent of the total population
• (2) for all urban wage earners and clerical workers (CPI-W) which covers 32 percent of the total population.

Among the CPI components are the costs of housing, food, transportation, and energy. While the CPI is not technically a cost of living index, it is often used to indicate changes in the cost-of-living.

For more assistance, call the Boston office of the Bureau of Labor Statistics at 617-565-2327.