What factor(s) specifically give(s) a Federal Reserve Dollar Note it's value? A Pound Sterling coin it's value? A five Euro note? A T-Bond or Bund? How about a Venezuelan Bolivar?
What gives a currency longevity overcoming the attacks from external powers? Power? Faith? Reputation? The alternatives currently available, or lack of alternatives possibly? And when a new alternative becomes available, from where does it truly get it's value? From where does it derive it's value ..... ?