It also included a new formula for the consumer price index applied to some entitlement benefits, much to the chagrin of liberals.

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In particular, he cited concessions that Obama made in his Monday counteroffer, including a new formula for the consumer price index applied to benefits.

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It also included a new formula for the consumer price index applied to benefits for programs such as Social Security, Medicare and Medicaid to protect against inflation, much to the chagrin of some liberals.

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It also had a new formula for the consumer price index -- called chained CPI -- that wraps in new assumptions on consumer habits in response to rising prices, such as seeking cheaper alternatives, and would result in smaller benefit increases.

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Colby's formula put a "buy" recommendation on the Brazil Index in April 2005 and kept it until June 2, 2006, for a 77% gain.

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America should index the retirement age to longevity and make the benefit formula for upper-income workers less generous.

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Using an obscure formula called the Herfindahl-Hirschman (sounds like a craft beer) Index, the government fears that both Budweiser and Corona would be able to raise their prices in lockstep after a merger, thereby harming consumers.

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The point about the formula effect is that it systematically pushes the RPI higher, relative to the other index, when inflation is positive.

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"The formula effect generally, and particularly in the case of clothing, is dependent not just on the choice of index but also on the characteristics of the price movements and levels being measured, sample design, choice of base period and price collection methods, " said its spokeswoman Jill Leyland.

BBC: Inflation: No change to RPI calculation