Very much a fan of the EU's Consumer Rights Directive, especially where it pertains to advertised prices. Even if some things have now skirted it, like sugar-tax and pfand in certain countries.
In my country at least, any business with a VAT number buys most things VAT-free and the end consumer is charged the whole amount, for the sake of doing less paperwork. Don't know how exactly it works when something is transformed into a lower-VAT output.
Mexico, like Europe, does include the VAT in prices advertised to consumers. That part of my comment was accurate.
As for Pfand (bottle deposit), that’s an interesting case. At least in Germany, they usually have to advertise the Pfand amount and list it individually on the receipt. But also, it’s similar to the situation businesses have with VAT: both for cultural reasons and due to the sums of money involved, it’s quite common for Germans to actually bother with returning bottles for the Pfand, so the extra cost effectively gets rebated for most purchases subject to Pfand. The whole system and the underlying psychological incentives would not work as well if the Pfand cost were more hidden than it is.
(Tangent: the above is discussing consumer-targeted prices only. Business-targeted prices often don’t include VAT in the advertised price, even in the EU, because most EU business can get a credit for VAT paid on inputs to a product or service in which they themselves charge VAT. Of course, receipts and invoices still break down all the details of which VAT rate is charged for which item, and sometimes why.)
The situation for disclosure of multiple overlapping sales taxes in the US (as is usually the case in NYC for example) is much less detailed, sadly, but even there it’s still usually clear which items are taxed or tax-free.