And in what proportion did the dollar get stronger/weaker? Not by that much. It would have been obvious in the prices of other things too.
The price of all goods declined by 3.0% during that 5-month period. U.S. demand for gasoline fell by about 2 million barrels per day between 2007 to 2009, while U.S. supply ticked up by about 1 million barrels per day. This also contributed to the price decline, but wasn’t the sole factor. Yet, U.S. oil demand hasn’t increased at all since 2009, while U.S. supply has ticked up by almost another 1 million barrels per day. So how would you explain the 90% price rise, which was the original question?
The money pumped into the economy in 2008 was for the financial crisis bailouts, not wasted just to spend money that we didn’t have. The 60% added to the national debt since 2009 has been mostly wasted on things that we didn’t need, and that didn’t address the root causes of the recession.