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> The only way that makes any sense is if you subtract returns for sales made in a different period to the sales period you are considering Exactly. That's the

• oncallthrow 1y ago
  But that isn’t how you calculate market share, so what you’re saying is nonsense.
  • msgilligan 1y ago
    That is how it was calculated in a published trade magazine (either Infoworld or MacWeek, I think) I'm not sure if the the analysis was done by a market research firm or the magazine.
    • oncallthrow 1y ago
      Presumably by a journalist who doesn’t understand what market share is
      • estimator7292 1y ago
        Everybody else is telling you you're wrong and you're doubling down and insisting that respectable journals are morons who don't understand anything. You should stop, reflect on this fact for a moment, then go pick up a goddamn book
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  • msgilligan 1y ago
    There are multiple ways of calculating market share (e.g. units vs dollars or for different time periods) but assuming it is measured in dollars for a quarterly time period, how would you calculate the market share based upon my sample data above?
    • oncallthrow 1y ago
      (company sales in period - company returns for sales made in said period) / (industry sales in period)
      • matt_kantor 1y ago
        With this formula market share for past periods can keep changing arbitrarily far into the future (depending on the companies' return policies).
        • oncallthrow 1y ago
          Yes.
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