Of the following, what was not an effort by the Truman administration to forestall an economic downturn?

The Truman administration implemented several measures to counter potential economic downturns, including the following:

1. The Marshall Plan: This was a program aimed at aiding Western Europe's economic recovery after World War II, which in turn helped to stimulate the U.S. economy.
2. Employment Measures: The administration made efforts to maintain high employment levels, including continuing wartime jobs and transitioning soldiers back to civilian life.
3. National Security and Defense Spending: Increased defense spending during the onset of the Cold War was used to boost the economy.

However, without the specific options provided in your question, it's difficult to point out which effort did not contribute to this goal. If you can share the specific options, I can help determine which was not an effort by the Truman administration to forestall an economic downturn.