Tax-exclusive prices hide the true cost and encourage overspending by making things falsely appear cheaper. Their purpose is for businesses to squeeze more from their customers.

In NZ the price you see is the price you pay. The sales tax amount is always clearly stated on receipts, invoices, checkouts, online carts, etc. (by law) and the rate has changed twice in history, so everyone knows when it happens and who is responsible. Everything is explicit and nothing is or can be hidden (we don't do tipping either). In comparison when I visited the USA I never knew how much I would be paying for things, which felt fundamentally unfair and customer-opposed.