Well my idea is like...
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yah know after 10 years of paying debts to the interest rate loaners the debtor countries have at least on average of interest rates paid minimum 100%, and if not close to, profit on the investment so be it that when the aforementioned period of 10 years has expired so does the interest rate on the debt. On an international trade level the debt release would level out when everyone has the decency to live up to it as for their and everyones children in a common bind.