If two products are poor substitutes,the calculation of a separate market volume variance and a separate market share variance for each product is NOT useful.

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Even if two products are poor substitutes, calculating separate market volume variance and market share variance for each can provide valuable insights into how each product is performing in terms of attracting customers and capturing or retaining market share, independent of their substitutability.

If Two Products Are Poor Substitutes,the Calculation of a Separate