What product models should be collapsed together and treated as a single model for purposes of calculating average prices?

FORBES: Protectionist Antidumping Regime is a Pox on America's Glass House

But in fact, the main reason for the two indices rising at different rates is because they use different arithmetical methods for calculating average prices.

BBC: New inflation measure proposed

Instead, in March 2013 it will launch an additional index called RPIJ, a new version of the RPI index but using the same methods as CPI for calculating average prices.

BBC: Q&A: Inflation changes

Which sales should be included in calculating average prices?

FORBES: Protectionist Antidumping Regime is a Pox on America's Glass House

But this seemingly mechanical exercise of comparing prices and calculating margins is rife with subjective interference and methodological sleights of hand.

FORBES: Protectionist Antidumping Regime is a Pox on America's Glass House

But while it sounds innocuous, calculating benefits for future retirees based the rise in prices instead of wages, is a big change.

NPR: Where Do the Candidates Stand on Social Security?

This budget proposal aims to control Social Security expenditures by calculating cost of living adjustments (COLA) in a way that proponents argue is a more accurate reflection of how prices for consumer goods fluctuate.

FORBES: Why Veterans' Advocates Don't Like Chained CPI