This is normal for the Economist. I don't really understand why -- they clearly have an American edition (I get their print version in the US and its headlines and organization is totally different than the same edition in the UK), yet they leave all the "colours" and "boffins" in there, when it would be pretty trivial to regionalize the language same as they do the currencies and structure. My assumption is that being a bit eccentric and foreign-seeming is part of their brand.