But we don’t have tariff regimes. That what a common market means. It doesn’t mean that you can sell the same product to everyone. It just means that you can move that product everywhere. And even the regulatory regime is overwhelmingly European (that’s why you get manuals in 20 languages)

You don't have tariff regimes within the common market, that's true. You do have tariffs on goods that are imported from any country other than the 24 in the EEA.

US is as scattered with ecery state having their own legislation.

I think interstate commerce law is intended to minimize inefficiencies due to that? I'm not sure.

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

Yeah. You really made an exceptional comment that I don't think anybody can argue with! Kudos!