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Many conspiracy theorists believe Gadaffi was killed because he only wanted to accept gold for Libya's oil. That would have completely undermined the United States dollar and exposed it as worthless numbers in a computer screen that can be created at will.
Or you know, it could also be because he was a brutal, divisive dictator. That conspiracy theory is grounded on the assumption that the concept of petrodollar is still significant to the strength of the USD, and I simply don't believe that it still is.
Worthless numbers in a computer screen that can be created at will could also be used to describe just about every other fiat currency there is, so why stop at USD? Why isn't other fiat being exposed when they don't have oil or anything backing them?