I am talking about the way that a business operates, it does not change due to the nrst, because the nrst does not tax businesses in any way, until the final sale is made.
Perhaps you are confused with a VAT, or ? Actually, I have no idea what you are talking about.
If each stage saves 9%, the total savings will be more than 9% of the pre-saving-on-each-stage price.
This is easy to model. Have you tried?