I did not find the cost.org article helpful at all. It just seems to advocate that if a business has customers, then everything it buys is a business input, any

I did not find the cost.org article helpful at all. It just seems to advocate that if a business has customers, then everything it buys is a business input, any sales tax the business would pay would be "pyramiding", and the business should be exempt from paying tax on all of it, even things like the pens, paper, and envelopes it uses for old-fashioned business correspondence.