The Consumer Price Index for All Urban Consumers (CPI-U) increased 0.3 percent on a seasonally adjusted basis in September, after rising 0.4 percent in August, the U.S. Bureau of Labor Statistics reported today. Over the last 12 months, the all items index increased 3.0 percent before seasonal adjustment.

Note that September CPI data collection was completed before the lapse in appropriations. The index for gasoline rose 4.1 percent in September and was the largest factor in the all items monthly increase, as the index for energy rose 1.5 percent over the month. The food index increased 0.2 percent over the month as the food at home index rose 0.3 percent and the food away from home index increased 0.1 percent.

The index for all items less food and energy rose 0.2 percent in September, after rising 0.3 percent in each of the 2 preceding months. Indexes that increased over the month include shelter, airline fares, recreation, household furnishings and operations, and apparel. The indexes for motor vehicle insurance, used cars and trucks, and communication were among the few major indexes that decreased in September.

The all items index rose 3.0 percent for the 12 months ending September, after rising 2.9 percent over the 12 months ending August. The all items less food and energy index also rose 3.0 percent over the last 12 months. The energy index increased 2.8 percent for the 12 months ending September. The food index increased 3.1 percent over the last year.

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.