Hacker News

across the US

Ah, that explains it. Over here in Germany, presumably the entirety of the EU and likelu most of the world this is not allowed:

Any business offering goods or services to consumers or advertising goods or services to consumers by stating prices must state the total prices.

§ 3 (1), PAngV

Of course, this isn't nearly detailed enough. That's why, for restaurants etc. the following applies:

The price lists must either be clearly legible at the time of the offer, displayed on tables or presented to each guest before orders are taken and upon request when the order is settled. A price list showing the prices of the main food and drink on offer must be displayed next to the entrance to the restaurant. If the restaurant is part of another establishment, it is sufficient to display the price list at the entrance to the restaurant section.

§ 13 (2), PAngV

Just listing the menu with "market price" would violate both these paragraphs. The following exists as well:

The prices listed in the price lists in accordance with sections 1 to 3 must include the service charge and all other surcharges.

§ 13 (5), PAngV