If I buy something for $100, I would pay sales tax on it. But is that really it for purchases? Isn't the government collecting taxes at several other points as the good is being made and brought to market? Taxes on raw materials, on components making the product, taxes on shipping, etc.
All in all, if I buy something for $100, how much is the tax collected by the government (in addition to what is taken from my income leaving me this $100 to spend)? Is all of that taken into account in this report?