You want money in nominal terms, so PPP doesn't matter. EU is not really a single market, they have unified regulations, which is helpful, but at the very least language differences mean you're doing custom work for every country.
> EU is not really a single market, they have unified regulations, which is helpful
The EU doesn't really have unified regulations. I mean, regulations passed at the EU level are unified, but countries have a great degree of country-specific regulations themselves.
Now, technically states within the US have the ability to regulate things at the state level, but due to various aspects of Constitutional law (the Commerce Clause, and case law such as the Sherman Antitrust Act, etc.), there are far fewer state-specific regulations that companies have to worry about for interstate commerce within the US than international commerce within the EU. Unless you're dealing with very specific regulated industries (money transmission, health insurance, etc.), you generally don't have to worry about a lot for basic interstate commerce in the US.
