In my opinion, free movement is the most important human right. When individuals are given the widest possible horizon of people who they may associate with, the boundaries of human creativity are expanded. Free movement of labour is an essential component of the market, and the existence of multiple cultures within a society reduces the capacity for any one corporate entity to gain a foothold and consolidate its power into a monopoly.
Disagree with this entirely. The left constantly points out that the right uses cultural friction to divide the working class against itself and reduce solidarity, and they they're right. Because of this, multiple cultures within a society make it much easier for a corporate entity to solidify its power because it creates multiple fracture points in the working class for them to exploit (which is why all of these megacorporations are so big on multiculturalism). Free movement of labor is not 'an essential component of the market'; that statement is prima facie absurd since markets have existed long before labor mobility has. In fact, free trade theory as put forth by Ricardo rather explicitly states that things like comparative advantage fall apart if capital and labor are mobile (in the modern day, they both are). Nowadays, both of those things lead to a race to the bottom as far as wages are concerned, and also causes a feedback loop. Lower wages coupled with readily available contraception leads to lower birth rates among the working class, which leads to a labor shortage. In order to stave off the wage increases which this would normally cause, we end up in a situation of easy credit and imported cheap/scab labor. The bad combination of a widening wealth gap, a working class increasingly incapable of organization, and endless credit bubbles and speculation on bad debt severely destabilizes governments. Look for Renaissance Florence for a salient example: oligarchy, endless war, bread and circuses, extreme poverty, extreme urbanization, and overleveraged banks which become reliant on government funds.
When individuals are given the widest possible horizon of people who they may associate with, the boundaries of human creativity are expanded.
People aren't more creative nowadays. Far from it. The combination of multicult and the metastatization of pressure to conform within online/urban/suburban communities has lead to the bleeding of separate, vibrant cultures into grey, consumerized porridge, It's the exact opposite. The big city is where people who have the same kind of soul clot together into little self-reinforcing cliques. When you are forced to interact with a small number of unique people and are not allowed to choose from a vast pool, then you are forced to come to terms with human frailty, differences, and foibles, which is the seed of so many great creative works.