can you help me solve the problem?

https://www.youtube.com/watch?v=-OzBI2r0Xb8&feature=emb_title

The next questions relate the whole content in this movie, to what we have learned throughout the course. 1. Explain how the Fed raising interest rates leads to a fall in disposable income for homeowners with Adjustable Rate Mortgages. 2. Explain through the Keynesian multiplier how the crisis was selfreinforcing, and how a small initial shock could have led to so many homeless people. 3. Why was it so hard to bet against the housing market? Give at least two reasons for this. 4. What were the main contributing factors to the financial crisis, according to The Big Short? How can you make sense of it in terms of a fundamental excess of saving over investment