The European Union broadly believes in this and to my understanding the situation is broadly 'better' here than in North America.
E.g. If I shop for plane tickets and I see a flight advertised for, say, 92 EUR I know that the price includes all taxes (sales taxes and airport taxes). Credit-card processing fees are (I think) no longer permitted.
It's not a perfect system - there are still the 'optional' extras (hold-bags, seat-bookings, insurance) extras on top of the price (and sometimes dark patterns to make you pay for them).
In a related matter, in the UK (not sure about the EU) there are advertising regulations which cover 'from' prices. I believe here if you advertise a price as 'from XXX' (e.g. 'flights to Berlin from 50 GBP') then at least 10% of the inventory needs to be available at that price. So no having a single seat on a 150 seat plane available at an artificially low price.
You might have chosen the worst example; the US regulations at ticket time are better for the customer.
The US "DOT requires airlines and travel agencies that display ticket prices to advertise the total price that a consumer must pay to purchase a ticket. Wherever an airfare is advertised, such as on a website, in an email, or during the booking process, the fare price must include all applicable government taxes and fees, and any mandatory carrier-imposed surcharges." Furthermore, if you're buying a ticket with an US segment 7 days or more from departure directly from an airline, the airline must typically "allow passengers to cancel their reservation within 24 hours and receive a full refund without a penalty."* This is something not afforded to customers on an intra-Europe flight.
*They can also offer a 24 hour hold free of charge, but the only airline that I know of that opts for this still allows the 24 hour cancel even after the hold.
E.g. If I shop for plane tickets and I see a flight advertised for, say, 92 EUR I know that the price includes all taxes (sales taxes and airport taxes). Credit-card processing fees are (I think) no longer permitted.
It's not a perfect system - there are still the 'optional' extras (hold-bags, seat-bookings, insurance) extras on top of the price (and sometimes dark patterns to make you pay for them).
In a related matter, in the UK (not sure about the EU) there are advertising regulations which cover 'from' prices. I believe here if you advertise a price as 'from XXX' (e.g. 'flights to Berlin from 50 GBP') then at least 10% of the inventory needs to be available at that price. So no having a single seat on a 150 seat plane available at an artificially low price.