Question: what is the difference between cpi and chained cpi?
Answer: Typically, the difference in growth between traditional CPI and chained CPI is a few tenths of a percentage point. Over time, that adds up. Since 2000, CPI-U, the inflation measure used by the government to adjust the tax brackets, is up 45.7 percent, compared with a 39.7 percent gain for chained CPI.