Tiff Macklem began his current part-time job as Governor of the Bank of Canada in 2020, immediately implementing a monetary policy which reduced the annual riskless rate of interest to two percent, where it has remained ever since. He celebrated by purchasing a palatial residence, adjacent to the Bank, in December of that year. Contributing 20% of the price of this residence with his own funds, Tiff was simultaneously able to obtain a mortgage, amortized as a zero-coupon loan with a two-year maturity, an annual coupon rate of eight percent, a single repayment at its two year maturity of $1,866, 240.00, and an initial balance of $1,600,000.00. While Tiff's residence has been appreciating at an annual rate of ten percent, the night before the due date of his repayment, its price plunged to $1,900, 000.00 upon that afternoon's unanticipated news that Donald Trump will begin developing the Melania, a 200 story condominium complex, across the street. Tiff must now decide whether to repay his lender tomorrow, and asks you to give him some financial advice."

k. Assuming Trump did announce his plan today and Tiff chooses to default and repay nothing to the lender tomorrow, what would be his analogous one-year return on equity from year 1 to year 2?

L. Assuming Trump did announce his plan today but Tiff chooses to repay his loan in full tomorrow, what would be his one-year return on equity from year 1 to year 2?

m. Assuming no independent costs to default, what are the respective costs to Tiff and to the lender tomorrow if Tiff chooses to default?

n. Assuming no independent costs to default but Tiff decides to repay his loan in full, what are the respective costs to Tiff and to the lender tomorrow?

o. Tiff's assistant reminds him that, rather than having no independent costs, defaulting on his mort- gage would cost Tiff an additional $150,000.00, over and above his loss of equity, in terms of the reduction in his credit score and inability to obtain credit on his current terms in the future. If so, what would be the crucial house value at which Tiff would be indifferent between defaulting and repaying the loan?

p. At date 0, the time of loan origination, what was the dollar value of Cliff's credit risk to the lender? q. Since a risky mortgage consists of a riskless mortgage and an implicit put (default) option sold by the lender to the borrower, what is the dollar value of this option to default at date 0?