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I’m old enough to remember when all you needed to do to persuade an executive about an issue was to show him some data in a spreadsheet. “The computer is always right,” they thought, so they went along with whatever you presented. (OK, I am older than dirt.) Now people quickly started to realize that you could manipulate a spreadsheet in a million ways to make the calculations come out your way, but there is still plenty of magical thinking going on, where we believe whatever the computer says instead of using our own judgment. If you are counting on magical marketing, you’ll probably have a problem sooner rather than later.