Interest Rate

An interest rate is the cost of borrowing or the reward for lending, set by markets and central banks.

Common mix-ups

Rates move for inflation, growth, and policy; the drivers mix constantly.

Picture this

Rates near zero make borrowing nearly free, so businesses borrow to expand, homebuyers stretch into bigger mortgages, and investors bid up stocks whose future profits look more valuable against cheap money. Then the central bank hikes rates from 0% to 5%: mortgages double in cost, expansions stall, and the same stocks fall as investors demand a better discount. The scenario is the interest-rate gravity in action — one number changing a few points reshuffles the value of every asset, home, and business in the economy.

How to apply it

Watch the rate cycle as a background condition for your portfolio: rising rates favour cash and short bonds, falling rates favour long bonds and growth assets. Do not try to trade every Fed meeting; understand the direction, not the week.

What it means for you

It is the gravity of all asset prices; up pulls most down, down lifts them.

A quick example

Key takeaway

The interest rate is the gravity of all asset prices: when it rises, borrowing costs climb, future profits are discounted more heavily, and most assets fall; when it falls, the reverse. One number changing a few points reshuffles the value of every mortgage, bond, stock, and business. Watch the direction of the rate cycle rather than individual meetings, because the trend, not the week, drives allocation. Low rates inflate asset prices; high rates deflate them.

Definitions reviewed by the Investing Glossary editorial team.