Contract Indices

What inflation measure or index do buy-side companies use for annual price increases in contracts that last longer than one year? 

We have traditionally used CPI (Consumer Price Index), but are looking at other measures since our providers are not consumers, and some of their costs (computing, data storage as examples) are lower than in previous years. While labor is consistently getting more expensive, productivity gains tend to offset that increase. Finally, energy and regulatory/tax expenses drive some change in expense but these are much more volatile and therefore often discounted in the measurement of inflation.

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