Answer:
The financial plan in the 1920s that extended Germany's payoff period all the way to 1988 was the Young Plan.
Explanation:
The Young Plan was the last of the reparation plans that regulated the payment obligations of the German Reich based on the Treaty of Versailles. It was negotiated by a panel of international financial experts in Paris from February to June 1929, and the final formulation was given at two government conferences in August 1929 and January 1930 in The Hague. It came into effect on May 17, 1930 retrospectively as of September 1, 1929 and set an average annuity of around two billion Reichsmarks, most of which were to be paid in foreign currency. It was to last until 1988, but was suspended by the Hoover moratorium in June 1931 and lifted by the Lausanne Conference in July 1932.
