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Answer: A bond that is upgraded in Year 1 would be more likely to be upgraded in Year 2 than is indicated by the corresponding probability in the transition matrix.
## Explanation **B is correct.** This describes the **ratings momentum phenomenon**. When a bond is upgraded in one year, it is more likely to be upgraded again in the following year than what would be suggested by the standard transition matrix probabilities alone. **Why other options are incorrect:** - **A is incorrect:** Investment-grade bonds actually have **more stable ratings** than speculative-grade bonds. Investment-grade ratings tend to remain unchanged more frequently due to the financial stability of these issuers. - **C is incorrect:** While external ratings are designed to be through-the-cycle, in practice, rating transition matrices **do depend on economic cycles**. During recessions, downgrade probabilities increase significantly, so a downward economic revision would affect transition probabilities. - **D is incorrect:** The assumption of independence between consecutive years' rating changes is **not realistic** due to the ratings momentum phenomenon. In reality, rating changes exhibit serial correlation - an upgrade in one year makes another upgrade more likely in the next year. **Key Concept:** Rating transition matrices capture the probabilities of rating migrations, but they should be used with awareness of real-world phenomena like ratings momentum and economic cycle dependencies.
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A risk analyst at a fixed-income investment firm has acquired a rating transition matrix issued by a rating agency to use in estimating credit risks in the firm's bond portfolio. The analyst plans to use it to forecast rating changes in the upcoming year (Year 1) and the following year (Year 2). Which of the following would the analyst be correct to note when using the rating transition matrix in estimating credit risk?
A
An investment-grade bond is less likely to have its rating remain unchanged over the course of Year 1 than a speculative-grade bond.
B
A bond that is upgraded in Year 1 would be more likely to be upgraded in Year 2 than is indicated by the corresponding probability in the transition matrix.
C
Since external ratings are through-the-cycle, probabilities predicted for Year 2 using the matrix should remain accurate if the economic forecast for the year is revised significantly downward.
D
An assumption that rating changes in consecutive years are independent events produces the most realistic estimates of multi-year rating transitions.