Do your self a favor and read the whole article to help with understanding of how and why the CPI is understated.
http://maxspeak.org/mt/archives/001895.html#moreWhy deny inflation? Those in power have several reasons to understate rises in the cost of living (COL), measured by the CPI.
1. To mask the fall of real wage rates. This is supposed to placate working voters. It is supposed to support orators declaiming that our standard of living is ever rising, and we should all feel good. Actually, real wage rates have fallen steadily since peaking in about 1975. That is using the official Consumer Price Index (CPI) to measure rises in the COL. If the CPI understates rises in the COL, real wage rates have fallen even faster than the data show.
As a by-product, this denial of inflation supports those who like to dismiss George as a false prophet of doom.
3. To slow the rise of income tax brackets, which are indexed to the CPI. That is, when the CPI rises by, say, 5%, the income level at which you pass into a higher tax bracket also rises by 5%. Congress, for once in a reasonable mood, enacted this sensible provision when enough people became aware that they were victims of “bracket creep”. Bracket creep is when inflation boosts your money income into a higher tax bracket, although your real income has not risen.
However, if the true COL rises by 10%, while the CPI rises by only 5%, this provision no longer protects us against bracket creep. It just gives a talking point to those who claim to protect us. Sneaky! That is why you, dear reader, may have had a hard time following the bean under one of the three shells. Politicians, of course, are good at withdrawing promises. The sneakier the method, the easier it is for them to cover their tracks.