consumer prices dropped?

[jschism]

this is from an article on comcast news page:
There had been a COLA every year from 1975 through 2009, when a spike in energy prices resulted in a 5.8 percent increase, the largest in 27 years. Since then, the recession has depressed consumer prices, resulting in no COLA in 2010 or 2011.
Older people might feel they are falling behind because they haven't had a raise since 2009, but many are benefiting, said Andrew Biggs, a former deputy commissioner of the Social Security Administration who is now a resident scholar at the American Enterprise Institute.
Consumer prices dropped, but Social Security benefits didn't drop, Biggs said. At the same time, health care costs went up, but Part B premiums stayed the same for most

just wondering what the "consumer" prices dropped on? food, gas, groceries, meds, and just about everything has gone up in price.