Many of us are in the habit of mentally calculating it wherever we live though.
For example, my state sales tax is 6.88%, my county has a .25% tax on top of that, and then there’s a metro area tax of 1% on top of that, my city does not impose a separate tax of their own, so total sales tax in my city is 8.13%.
When shopping we’ll do the mental math (roughly) and factor that in so it might say $39.99 + tax but I know that it’ll be a little under $44 with tax.
It’s inconvenient but, like most things, we get used to it and adapt. Also, while tax varies a lot by state, most of us don’t venture too far out of our home area so tax is roughly the same all the places we regularly go.
It would be nice to have the price listed as the price you pay but it doesn’t work as well with our current system.
On a large scale I have no idea but it does for me when I’m driving.
A crosswalk at an intersection, especially an unmetered one, serves as a warning that there’s enough regular pedestrian traffic or a risk that dictated it was needed.
Helps me, personally, to be extra aware for crossers.