Professional Guide to PayDay Loans

As mentioned before, from an active portfolio manager’s perspective a major concern is migration risk. Investors who do not hold a bond until maturity have to be compensated for a possible deterioration in credit quality, a potentially resulting downgrade and increased volatility. This becomes even more important if the downgrade triggers investment restrictions. For a specific corporate bond the expected excess return over duration-matched government bonds can be estimated in three steps:

• The probability of rating changes are derived from a rating transition matrix;
• Spread and price changes for up- and downgraded bonds have to be estimated.
• Expected return is computed as the weighted sum of the price changes.

Consider a portfolio of 5-year A-rated US corporate bonds. Between 1989 and 2003 they traded on average at a premium of about 100 bp over durationmatched government bonds which is roughly the level that was reached in August 2003. Our show study s that 91.20 percent of these bonds maintain their rating and hence can be expected to earn an excess return of 100 bp over a 1-year time-horizon. Of the bonds rated A at the beginning of the year 2.66 percent can be expected to receive an upgrade in the course of the year.

Investors would expect to benefit from a subsequent spread tightening to an average of 55 bp if upgraded to Aaa or 70 bp if the bonds are upgraded to Aa. Conversely, downgrades below A would result in widening credit spreads and consequently negative excess returns versus duration-matched government bonds. Differences in accrued interest between corporate bonds and government bonds can be considered at this stage.