What you see is what you pay

What you see is what you pay in Argentina. It makes so much more sense than in the U.S., where they add state sales tax to everything.

I just don't understand why sales tax isn't included in the price of things in the U.S.. Every state has a different tax, and for a transient like me, there is no chance of me knowing how much money to get out at the cash registers. I lived in Nevada for almost a year, and couldn't tell you what % the sales tax is.

I'm perplexed. There isn't a single reason that I can think of that adding tax at the end of a bill is better.