Which currency in the world has the highest value?
user
Well, I think that depends a lot on the value that people attribute to their own money, and to the tradeability of goods and services.  So, to answer your question, I think the best answer would be the one you want to hear.
assistant
Which currency in the world has the highest value?
user
Which currency do you want to know about? For example, the U.S. dollar is a currency that’s used in the U.S. and many other countries, too.
assistant
Which currency in the world has the highest value?