Interest Rates Explained

The price of money touches nearly everything in markets — from mortgage payments to how a stock gets valued.

The price of money

An interest rate is, at its core, the price of borrowing money — or the reward for lending it. When rates rise, borrowing gets more expensive across the economy: mortgages, auto loans, credit cards, and corporate debt all cost more to service. When rates fall, borrowing gets cheaper, which tends to encourage spending and investment. Because nearly every business and household interacts with credit in some form, rate changes ripple far beyond the loans they directly touch.

The starting point for most of these ripples is a policy rate set by a central bank, which then influences the rates banks charge each other and, in turn, the rates offered to consumers and businesses. Add a risk premium on top — reflecting how likely a borrower is to repay — and you get the actual rate a homebuyer or a corporation pays, which is why a change in the policy rate doesn't move every borrowing cost by exactly the same amount.

Borrowing, investment, and corporate earnings

Companies routinely borrow to fund expansion, buy back stock, or manage operations, so a rise in rates raises their cost of capital and can squeeze profit margins — particularly for companies carrying heavy debt or relying on continuous financing to grow. Lower rates ease that pressure and can make growth investments more attractive, since future profits are easier to justify when financing them is cheap.

Bonds and yields

Bond prices and interest rates move in opposite directions: when rates rise, existing bonds paying a lower fixed rate become less attractive, so their prices fall to compensate new buyers; when rates fall, those same higher-paying bonds become more valuable. This relationship is why Treasury yields are watched so closely as a real-time gauge of where the market thinks rates are headed.

Currencies and stock valuations

Higher rates tend to attract foreign capital seeking better returns, which can strengthen a currency, while lower rates can have the opposite effect. In equities, rates factor directly into valuation: analysts discount a company's expected future cash flows back to a present value, and a higher discount rate makes those future dollars worth less today. That's a major reason growth stocks, whose value depends heavily on earnings expected years out, tend to be more sensitive to rate changes than mature, steady-cash-flow businesses.

Dividend-paying and other income-oriented stocks feel a related pressure: when safe government bonds start paying a competitive yield, some of the income-seeking capital that might otherwise sit in dividend stocks has a lower-risk alternative, which can weigh on those shares as rates climb. None of these relationships are mechanical in every single case, but they're the baseline logic markets use to reason about what a rate move should mean for asset prices.