“An ungodly amount of money”
The current outlay by the US government in response the the financial *situation* has now surpassed the value of the Marshall Plan, Louisiana Purchase, Race to the Moon, Korean War, New Deal, Vietnam and Iraq Wars and more – COMBINED. ADJUSTED FOR INFLATION.
These numbers are from Bianco Research, via Barry Ritholtz
Bloomberg calculates the total amount the taxpayer is on the hook for [currently] is $7.76 trillion, or $24,000 for every man woman and child in the country. (Data breakdown is here)
• Marshall Plan: Cost: $12.7 billion, Inflation Adjusted Cost: $115.3 billion
• Louisiana Purchase: Cost: $15 million, Inflation Adjusted Cost: $217 billion
• Race to the Moon: Cost: $36.4 billion, Inflation Adjusted Cost: $237 billion
• S&L Crisis: Cost: $153 billion, Inflation Adjusted Cost: $256 billion
• Korean War: Cost: $54 billion, Inflation Adjusted Cost: $454 billion
• The New Deal: Cost: $32 billion (Est), Inflation Adjusted Cost: $500 billion (Est)
• Invasion of Iraq: Cost: $551b, Inflation Adjusted Cost: $597 billion
• Vietnam War: Cost: $111 billion, Inflation Adjusted Cost: $698 billion
• NASA: Cost: $416.7 billion, Inflation Adjusted Cost: $851.2 billionTOTAL: $3.92 trillion
As a caveat; I don’t think the full amount of the current outlay is necessarily comparable, as in some cases it has been used for stock buys and other things which could provide returns with interest at some point in the future. But still, we bought half the continental US for an order of magnitude less than we’ve spent trying to save our banking system.

