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highly predictable life for the PAC tranche- initial PAC collar gives a range- the planned amortization schedule promised to the PAC I tranche is the minimum of the two prepayment speeds
potential to change two notches
- never use nominal spread- Z-spread is only used with no prepayment
bonds (autos, credit cards)- if not IR dependent, use binomial model- if
dependent, use Monte Carlo
- associated with interest rate increases and falling prepayment
rates- fewer repayments, bond values fall, and investors get their
principal back slower and can't reinvest
- lately, it is a 1st lien on property owned by a borrower that has a
marginal credit history- closed end HELs are like normal loans-
Non-accelerating senior tranches (NAS) usually don't receive prepayments
early on and then receive a lot later one
- increases the option costs and reduces the value of the MBS (which is short the prepayment option)
- there is no credit risk (issue and and benchmark are assumed to be
the same)- liquidity risk relative to issuer's other securities
(typically small)- thus, since all risks are basically removed, OAS of 0
= fairly valued
- each class of bonds is retired sequentially- last tranche is called the Z-tranche or the accrual tranche
- must be added to every spot rate along every interest rate path- MBS
are interest rate path dependent, thus you can't use backward
induction- cheap securities have high OAS relative to the required OAS
and low option costs (for a given Z-spread and effective duration)
- prepayments are not significant (small loans, quickly depreciating assets, low credit ratings)
- represents a claim against a pool of mortgages- passthrough rates
are less than the average coupon rate due to fees- passthrough
securities traded in the secondary market effectively converts illiquid
mortgages into liquid securities, aka securitization
- the discount rate that makes the price of a MBS or ABS equal to the
PV of its cash flows- in order to compute this, we must make a
prepayment assumption and default/recovery assumptions if a non-agency
issue- has reinvestment, price, and prepayment risk
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