This paper models Continuous Workout Mortgages (CWMs) in an economic environment with reﬁnancings and prepayments by employing a market-observable variable such as the house price index of the pertaining locality. Our main results include: (a) explicit modelling of repayment and interest-only CWMs; (b) closed form formulae for mortgage payment and mortgage balance of a repayment CWM; (c) a closed form formula for the actuarially fair mortgage rate of an interest-only CWM. For repayment CWMs we extend our analysis to include two negotiable parameters: adjustable “workout proportion” and adjustable “workout threshold.” These results are of importance as they not only help understanding the mechanics of CWMs and estimating key contract parameters. These results are of importance as they not only help in the understanding of the mechanics of CWMs and estimating key contract parameters, but they also provide guidance on how to enhance the resilience of the ﬁnancial architecture and mitigate systemic risk.
Shiller, Robert J.; Wojakowski, Rafal M.; Ebrahim, M. Shahid; and Shackleton, Mark B., "Continuous Workout Mortgages" (2011). Cowles Foundation Discussion Papers. 2137.