See [1] for a more in-depth analysis of this, and much more.
"In America, for example, the benchmark measure of inflation (CPI-U) has been modified by ‘substitution’,
‘hedonics’ and ‘geometric weighting’ to the point where reported numbers seem to be at least six percentage
points lower than they would have been under the ‘pre-tinkering’ basis of calculation used until the early 1980s."
"In America, for example, the benchmark measure of inflation (CPI-U) has been modified by ‘substitution’, ‘hedonics’ and ‘geometric weighting’ to the point where reported numbers seem to be at least six percentage points lower than they would have been under the ‘pre-tinkering’ basis of calculation used until the early 1980s."
[1] https://ftalphaville-cdn.ft.com/wp-content/uploads/2013/01/P...