A question

Dear Sirs,

I cannot find an answer to a very simple, and therefore stupid question: 
What is (are) the formal definition(s) of the term “world-system” as viewed 
from the world-systems perspective? I am now writing a report on the 
world-systems analysis in Russian, and the most important thing that I 
cannot find is precisely the above definition. I will highly appreciate your 
help, and apologize for the trouble.

Evgeni Nikolaev.


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