This method does not guarantee correct results; but it does establish a first estimate which might be off by no more than a factor of 2 or 3--certainly well within a factor of, say, 10. We know, for example, that we should not expect 15 piano tuners, or 1,500 piano tuners.
No, it's a very useful tool.
12 piano tuners
True, but (...) you have to accept that when you make estimates of this sort you can easily be off by an order of magnitude in either direction.
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