As an assistant vice president at a regional bank, your boss has tasked you and the other AVPs to work in a group to acquire $100 million of residential mortgages to be securitized in a pass-through MBS. There must be between 250-300 mortgages in the portfolio, none of them with a maturity below 200 months or greater than 360 months. In the interest of time, your boss suggests that the group assign group members to find (meaning create some hypothetical) a group of diverse mortgages (meaning each with a different interest rate, principal amount, and maturity) and then calculate the portfolio WAC and WAM. Provide your boss with a summary spreadsheet that shows the individual mortgages and the portfolio's WAC and WAM calculations, along with a memo of at least 300 words that explains the following:

• The number of residential mortgages in the portfolio and the range of principal values, interest rates, and maturities
• The residential mortgage portfolio's WAC and WAM
• A discussion of the WAC of the pass-through MBS the group has created and whether it represents a coupon rate indicative of a high credit quality or a lower credit quality pool of mortgages. Include in the discussion the MBS issue's spread over the comparable Treasury rate.
• Include in your analysis at least 1 outside source for the Treasury rate.