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https://fxstreet.com/analysis/whats-happening-on-the-fiscal-front-202003171746Treasury Secretary Mnuchin has reportedly requested $850 billion to combat the economic effects of the virus. Were this request to be met, it would amount to about 4% of U.S. GDP. For context, the stimulus bill passed in February 2009 was about 5.5% of U.S. GDP.
During the Great Recession, the federal budget deficit peaked around 10% of GDP.
During World War II, the federal budget deficit peaked at nearly 30% of GDP in 1943, and was more than 20% each year in the 1943-1945 period (middle chart). A federal budget deficit of 30% of GDP today would amount to nearly $7 trillion.