It's an interesting argument. There has always been a lot of discussion around the classification of industries, google on SIC or NAICS and take a look at where various industries are classified, I'm sure you will be surprised by quite a few of them.
For instance, did you know that retail bakeries (e.g., doughnut shops) are included in the NAICS classification for bakery and tortilla manufacturers?
I don't buy into the argument fully but it's interesting.
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Strive to be more curious than ignorant.
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