Suppose that dairy products have risen in price relatively less than prices in general over the last several years.To which problem in the construction of the CPI is this "low" rate of price increase most relevant?

Question

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This "low" rate of price increase for dairy products relative to other goods may lead consumers to substitute dairy products for other more expensive goods. This substitution bias can result in an overstated CPI because it does not take into account the fact that consumers are substituting cheaper options.

Suppose That Dairy Products Have Risen in Price Relatively Less