The arguments of open-borders advocates may be applicable in some corners of the developed world. However, for small countries next to larger ones, open borders bring serious geopolitical consequences.
While the Secret Service is best known as the guys in sunglasses protecting the president of the United States, the SS actually was created to enforce the fiat money regime during the Lincoln administration.
When Carl Menger wrote his pathbreaking Principles in 1871, he challenged several schools of thought—and won. His intellectual revolution continues today.