About the tax evasion question again, though, the per capita in Greece is higher than the USA's. As Talos said, it's lower than the eurozone. But, tax evasion is only a measure of the money that should have been paid but wasn't. If your tax rates are lower, you could have a low tax revenue per capita AND a very low rate of tax evasion at the same time.

So, I would tend to look at tax revenue per capita, as the important thing.

This aerial/sat pictures to find out undeclared swimming pools meme has been popping up regularly as an urban legend in many countries (sunny ones mostly), such as the South of France. It may even be true...