In the end, productivity would have to rise about 3-1/2 percent per year, about 2 percentage points per year faster than the trustees’ current intermediate assumption, to eliminate the Social Security imbalance over seventy-five years; productivity growth would have to be even more rapid to achieve balance in perpetuity.
2  In particular, the chained CPI captures more fully than does the official CPI the way that consumers alter the mix of their expenditures in response to changes in relative prices. 2  BIS Review 13/2004  Another possible adjustment relates to the age at which Social Security and Medicare benefits will be provided.