Earlier quoted context omitted.
Then if we could pass a law mandating that prices be displayed inclusive of sales tax, that'd be great. One of my favorite parts about going to Europe is being able to add up prices in my head and have it match up exactly with the final total. The US system is nonsensical and shouldn't be used to justify other nonsensical policies like the continued use of the penny.
The problem with all prices being shown inclusive of tax is that the amount of the tax becomes forgotten over time. By having tax added and called out on the receipt at the register, everyone is reminded many times per day how much sales tax they're paying.
Every receipt breaks out the VAT and rate. Food, books and children's clothes (and a few other things) are exempt (UK).
All online purchases show VAT in the checkout and basket, and in the invoice after purchase.