What the above commenter means, is that in the EU (and many countries across the world) if a price tag says €10, you pay exactly €10. In the US, if the price tag says $10, you may end up paying $12 or something random amount on top of the signed price, because it doesn't include taxes, which makes shopping extremely inconvenient compared to taxes-included price tags.
It is still inconvenient for everyone. It like saying "Growing up, and living with the house full of lying rakes, I find it is trivial to deal with". Sure you are, but it is one thing what was solved decades ago and now nothing stops to at least having both prices on the tag.
https://educaloi.qc.ca/en/capsules/price-labelling-and-accur...
You'll note that if they put price stickers on the product, things are more lax.
And if they put nothing, you report it. And yes, it is enforced.
It is trivial to handle this stuff. Simple.