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The issue being discussed is the lack of price tags. If I'm a foreigner and don't speak the language, at least I know how much I'll pay beforehand.

Quite. Reading numbers is far easier than someone saying those numbers in a foreign language.

If someone speaks 10.43 to me in German, I have no idea.

Even street vendors in random Asian places will punch the numbers into calculator and show you. You don't have to understand the language.

Have to? No. But that's not the point.