Q. I’m editing an article submitted to an anthropological journal, and the author refers to someone being paid “2000 Euros” for one night. Is this an acceptable way to say it, or should the € sign be used?
A. Chicago style is to either use numbers with a symbol (or abbreviation) or spell out the whole phrase, so “€2,000” or “EUR 2,000” or “two thousand euros” would do. Please see CMOS 9.23.