Just before the collapse of the subprime mortgage market in 2007, the most important credit-rating agenciesrated mortgage-backed securities with Aaa and AAAratings. Explain how it was possible that a few monthsinto 2008, the same securities had the lowest possibleratings. Should we always trust credit-rating agencies?

Essentials Of Investments
11th Edition
ISBN:9781260013924
Author:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
Publisher:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
Chapter1: Investments: Background And Issues
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Just before the collapse of the subprime mortgage market in 2007, the most important credit-rating agencies
rated mortgage-backed securities with Aaa and AAA
ratings. Explain how it was possible that a few months
into 2008, the same securities had the lowest possible
ratings. Should we always trust credit-rating agencies?

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