Under the London Debts Agreement of 1953, the repayable amount was reduced by 50% to about 15 billion marks and stretched out over 30 years, and compared to the fast-growing German economy were of minor impact.
An important term of the agreement was that repayments were only due while West Germany ran a trade surplus, and that repayments were limited to 3% of export earnings. This gave Germany’s creditors a powerful incentive to import German goods, assisting reconstruction.
The agreement significantly contributed to the growth of the post-war German economy and reemergence of Germany as a world economic power. It allowed Germany to enter international economic institutions such as the World Bank, International Monetary Fund and World Trade Organization.
This is the only way to resolve unsustainable debt if you want future economic growth, peace and prosperity.