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Investopedia explains 'Yield-To-Average Life'
The yield-to-average life allows investors to determine the expected return when a bond is not held to maturity either because of sinking fund obligations or, in the case of mortgage-backed securities (MBS), because of the prepayment of the underlying mortgage debt. The yield-to-average life metric is used in regard to the pricing of mortgage-backed securities, such as collateralized mortgage obligations (CMOs) issued by the Federal Home Loan Mortgage Corporation and private issuers. Because an MBS generally repays principal throughout the life of the investment, the prepayment of the underlying mortgage debt can affect the investor’s return (depending on whether the MBS was purchased at a discount or at a premium).
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