The EU is not the biggest single market in the world. That depends on how wealthy a country is not its population
US 17.9 trillion, EU 16.2 trillion both in US dollars.
Philes like doing this trick.They say there are more immigrants from outside the EU than from inside. True but the difference is only 4000, 188000 from outside, 184000 from in EU. Not a statistically significant difference.