When the price of broccoli increases relative to cauliflower, people who buy fresh vegetables respond by buying more cauliflower and less broccoli. As a result, the CPI has

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When the price of one good increases relative to another, leading consumers to buy more of the cheaper good, it reflects a commodity substitution bias in the Consumer Price Index (CPI). This bias occurs because the CPI might not fully account for consumers switching their purchases from more expensive items to less expensive ones.

When the Price of Broccoli Increases Relative to Cauliflower, People