You're being obtuse. With those points I could argue the US isn't a single market either!

1. California has 10 million Spanish speakers 2. Every state has its own regulations and legislation (and taxes!)

But I don't think you would try to make that argument... right?

Free movement of labour and goods make a single market. The other stuff is just normal operational costs of doing business.

Also, and you know this: most of the EEA uses the Euro; the countries that don't are exceptions