FYI the concept of beef vs chicken came from the government’s Boskin Commission Report which was created by
The Advisory Commission To Study The Consumer Price Index (aka The Boskin Commission) was appointed by the Senate Finance Committee to study the role of the CPI in government benefit programs and to make recommendations for any needed changes in the CPI.
http://www.ssa.gov/history/reports/boskinrpt.html
Beef vs chicken was used as an example of ‘substitution’.
Don’t fall for the beef vs. chicken substitution BS. Read my comment #34, again.