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Where are you from? What is your native language?
That’s kind of a pointed question. I suppose the best way to answer it would be to say that to the extent that barriers to trade and communication are removed, trade (and therefore prosperity) will be affected in a positive way.
I’m not sure I understand the question. This may be a language barrier. I wouldn’t define “global society” as one in which everyone has the exact same culture. You don’t even define “society” as “a group of people with a single culture”. A common culture is not necessary to have a “society”. I tend to think of the word “society” in a more abstract sense…just a way to call a group of individuals who interact within a certain scope (and that scope can be as small or as big as you want it…from a small community to the entire planet).
It sounds like you’re asking If most libertarians are for or against “multi-culturalism”…I suppose you would have to define what you mean by that term.
Milton Friedman is typically associated with a school of economic thought known as the “Chicago School of economics”. The differences are discussed below:
The Chicago School versus the Austrian School
Vienna and Chicago: A Tale of Two Schools
Vienna and Chicago: Friends or Foes? A Tale of Two Schools of Free-Market Economics
Economics on Trial (Feb 1995)
Economics on Trial (March 1995)
Friedman vs. The Austrians, Part II: Was There an Inflationary Boom in the 1920s?
Austrians vs. The Chicago School, Part III