Normalization denominators should reflect scale or production activity to enable fair comparison. Which option is generally not an appropriate normalization denominator?

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Normalization aims to level the playing field by using a denominator that tracks actual activity or scale. Denominators like revenue, number of stores, or production space reflect how much business is being done or how much capacity exists, so they provide a fair basis for comparing intensity across entities.

Years of operation, by contrast, measures age or tenure, not current activity or production capacity. A company that has been operating a long time isn’t necessarily larger or more active today, and using years of operation can bias comparisons toward older firms rather than reflecting true scale. That’s why years of operation is generally not an appropriate normalization denominator.