MORAL HAZARD AND MBS Mortgage finance is conceptually simple. A saver lends money to a homeowner so he can buy a house. He then pays her back in installments, principal and interest, until the loan is extinguished. These flows of money were traditionally piped back and forth between savers and homeowners by local savings banks, or thrifts, designed for the purpose. Over the years, however, the "plumbing" to convey these flows has evolved into a nightmarish Rube Goldberg machine of securities, derivative instruments, vehicles, and intermediary markets. Moral hazard neatly encapsulates one thing that can go wrong with this complex…
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