As for the current crisis, my understanding that follows is mostly a collection between what I know of macro economics from academic studies, and from NPR, which provided a rather solid outlining of what may have occurred.
Citizens deposit their cash into banks, which then loan out most of it. These loans may be mortgages. On a bank's balance sheet, the mortgage is qualified as an asset, since it presumable is going to generate them some income. However, banks do have a limit to the risk they are comfortable with. They will attempt to sell mortgages to other firms and rid themselves of the risk at the expense of a higher payout. These firms, sometimes other banks, sometimes governments, sometimes those "investment bankers" that every one hates on, use a very few amount of credit agencies that make their business by analyzing the risk of certain loans, including mortgages. In the past few decades, banks have packaged assets(outstanding mortgages) with higher risk with ones with lower risk, making it easier to get rid of the higher risk assets.
Incredibly recently, the credit rating agencies, may have messed up their opinion of some of these packages. Some packages that were higher risk, were actually given the lowest possible risk rating. The banks continued giving out high risk mortgages, because they were still being bought, because those buying thought them to be actually low risk. The high risk mortgages started failing in the current crisis, and this caused contractions within the investment marketplace as firms lowered their limit to risk. Less loans were made, and with lower investment Real GDP falls. Lower GDP means lower employment.
This whole failure is compounded by banks being incentives since the 1990s to make increasingly high risk loans. Congress has wanted to expand housing, and they increased incentives over the decades for banks to make more housing loans. This would mean to make more high risk loans.
To reiterate: The banks were being pressured to make more high risk loans. These did so, and accelerated the process since they could sell the high risk loans. The loans could only be sold since they were labeled as low risk, by certain credit agencies. So if these agencies hadn't messed up, the banks wouldn't have been able to sell the high risk loans, and may not have made them, despite government incentives. So, to my perception, it was some small glitches in how packages of mortgages were being analyzed by certain consultants.
Excuse me if this isn't concise, a bit off hand, and I may be assuming that everyone has the same background in economics.
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