A bond can promise fixed cash flows while its market value changes every day. The apparent contradiction disappears once income, discount rates and default risk are treated as separate layers. Investors should not ask whether bonds are safe in the abstract; they should ask which cash flows they own, how sensitive those cash flows are to rates, and what must remain true for repayment.
Why bond prices fall when market yields rise
A fixed coupon becomes less attractive when newly issued bonds offer a higher yield. The existing bond must trade at a lower price so that its remaining cash flows provide a competitive return. The reverse generally happens when market yields decline.
This is a valuation relationship, not a punishment imposed on bondholders. An investor who can hold a sound bond to maturity may still receive the contracted cash flows, while an investor forced to sell earlier realizes the market-price change.
Current yield, YTM and total return answer different questions
Current yield divides annual coupon by market price and ignores the pull to par. Yield to maturity is the discount rate that equates today’s price with all promised cash flows under strong assumptions: timely payment, holding to maturity and reinvestment at the modeled rate.
Total return is what the investor actually earns after coupon income, reinvestment, price change, costs and any credit loss. YTM is a comparison tool, not a guaranteed outcome.
Duration estimates first-order rate sensitivity
Modified duration approximates the percentage price move for a one-percentage-point change in yield. A bond with duration seven could lose roughly 7% if its yield rises by one point, before the convexity adjustment.
Long maturities and low coupons usually increase duration. A bond fund does not mature like a single bond; it continuously replaces holdings, so investors need to review the portfolio’s current duration and mandate.
Convexity and embedded options change the result
The price–yield relationship is curved, so duration is only a local linear estimate. Positive convexity means price gains from a yield decline can exceed losses from an equal yield increase. Callable bonds can exhibit unfavorable convexity because the issuer may redeem them when rates fall.
For large rate moves, scenario analysis is more reliable than multiplying duration by the yield change.
Credit spread is compensation, not free yield
The spread over a comparable government benchmark reflects credit, liquidity and risk appetite. A wide spread can be an opportunity or evidence that expected losses are rising.
Review leverage, interest coverage, maturity walls, covenants, collateral and seniority. A rating is an input, not a substitute for underwriting.
KEY TAKEAWAY
A bond packages interest-rate, reinvestment, liquidity and credit risk. Read YTM together with duration, options and repayment capacity before assigning it a role in the portfolio.