non profitable exchange of currency was debt reason
source; IMF researcher
Solid exchange rate system - Wikipedia
1⃣ total quantity of Gold decrease, when exchange gold in not good rate for who rent gold.
2⃣ when profit of gold erased from account book, total profit also decrease
3⃣ solution = increase sum of gold
① with exchange
② with gold standard system (or some other resource)
③ with cript currency
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