Interest Rates & the Stock Market
Why a central bank raising or cutting rates moves stock valuations directly, not just borrowing costs.
Interest rates set by a central bank (the Federal Reserve, in the US) ripple through the economy, but they affect stock valuations through a specific, direct channel too: the discount rate used to value future cash flows (see the DCF lesson earlier in this track) typically moves with broader interest rates. When rates rise, future cash flows get discounted more heavily, lowering what those cash flows are worth today — pressuring valuations even if a company's actual business hasn't changed at all.
Rates also compete directly with stocks for investor capital: when a safe government bond pays a meaningfully higher yield, the extra return demanded to justify owning stocks instead goes up too, which tends to compress the multiples investors are willing to pay across the market.
A growth company's value rests heavily on cash flows expected many years in the future, while a mature value or dividend-paying company's value rests more on cash flows arriving sooner. Because a DCF discounts distant cash flows far more heavily than near-term ones, a given rise in the discount rate shrinks a growth company's valuation proportionally more.
Company A (mature, stable) expects most of its value from cash flows over the next 5 years. Company B (fast-growing) expects most of its value from cash flows 10-15 years out. A 2-percentage-point rise in the discount rate shrinks Company A's valuation by roughly 10%, but shrinks Company B's by closer to 25% — same rate change, because B's cash flows were further out and got discounted more heavily.
- Rate changes affect valuations directly through the discount-rate mechanism, independent of whether a company's actual business performance changed at all.
- Growth stocks (cash flows further out) are structurally more rate-sensitive than value or dividend stocks (cash flows sooner) — a pattern that shows up repeatedly across rate cycles.
- This is exactly why a single Fed rate announcement can move the entire stock market the same day, even though no individual company's earnings changed.