Michael Flynn has a good article at Reason on the Roots of the Crisis. He also makes the point that this is a Wall Street problem and not necessarily a general economic problem:
Let’s be clear: This is a Wall Street crisis, not a national economic crisis. The overall economy, while a bit weak, is still growing. Some politicians are comparing the current environment to the Great Depression. But in 1932, when the federal government last moved to bail out the banking sector, economic output had fallen 45 percent and unemployment was a staggering 24 percent. Today, economic output is actually up and unemployment is a historically modest 6.1 percent.
The overall economy doesn’t even face a liquidity crisis in the current turmoil. Consumer, commercial/industrial, and real estate loans are all up over last year. Main Street is doing fine. The liquidity crisis is confined to Wall Street, between and among investment banks, insurance and securities firms, and hedge funds. There is the possibility that the contagion could spread, but in a global capital market, this is hardly certain.
The article goes through how we arrived at this point in detail. Read the whole thing.