| Ludwig von Mises | There cannot be the slightest doubt that migration barriers diminish the productivity of human labor. | Liberalism | p. 139 | Immigration |
| Ludwig von Mises | The closed-door policy is one of the root causes of our wars. | Omnipotent Government | p. 263 | Immigration |
| Ludwig von Mises | Immigrants soon find their place in urban life, they soon adopt, externally, town manners and opinions, but for a long time they remain foreign to civic thought. One cannot make a social philosophy one's own as easily as a new costume. | Socialism | p. 38 | Immigration |
| Ludwig von Mises | The principles of freedom, which have gradually been gaining ground everywhere since the eighteenth century, gave people freedom of movement. | Nation, State, and Economy | p. 58 | Migration |
| Ludwig von Mises | A nation that believes in itself and its future, a nation that means to stress the sure feeling that its members are bound to one another not merely by accident of birth but also by the common possession of a culture that is valuable above all to each of them, would necessarily be able to remain unperturbed when it saw individual persons shift to other nations. | Nation, State, and Economy | p. 76 | Migration |