Compare the relationship between bond yields and interest rates. See how bond prices move inversely to interest rates and understand the impact of rate changes.
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The Seesaw: Bonds & Rates
In the world of investing, bond prices and interest rates live on opposite ends of a seesaw. This isn’t just a market quirk—it’s a matter of opportunity cost. If new bonds are issued with higher interest rates, your older bond with a lower rate becomes less attractive, causing its market price to drop until its yield matches the new market standard.
Theory vs. Market Reality
Our calculator provides a “controlled lab environment” where only interest rates move. In the live market, several “invisible hands” influence the price of your fixed-income investments simultaneously:
| Market Force | What the Calculator Shows | The Real-World Impact |
|---|---|---|
| Duration Risk | Simple linear price shifts. | Longer-term bonds crash harder when rates rise (High Sensitivity). |
| Credit Spreads | Assumes the issuer is 100% safe. | If an issuer’s health declines, the bond price drops even if rates stay flat. |
| The Yield Curve | Rates move the same for everyone. | Short-term rates might rise while long-term rates fall (Inversion). |
| Liquidity | Bonds can always be sold at “fair value.” | In a crisis, you may have to sell for much less than the math suggests. |
The Investor’s Rule of Thumb
“If you plan to hold a bond until maturity, market price fluctuations usually don’t matter to your final return. However, if you might need to sell early, understanding these interest rate sensitivities is the difference between a profit and a capital loss.”
