notes/10 - Projects/CSC/Chapter 7/YTM.md
2026-03-30 03:23:09 -04:00

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Markdown

YTM is the most comprehensive yield measure because it accounts for three things:
- Coupon income
- Capital gain or loss (if bought below or above par)
- Reinvestment of coupons at the same rate
That last assumption — reinvesting coupons at the same YTM — is also its main weakness, because interest rates change over time. That's called **reinvestment risk**.
One key fact worth memorizing: **when a bond trades at par, current yield = approximate YTM = YTM.** They're only equal at par.