What Is an Interest Rate — The Price of Money
'Rate hike,' 'rate hold'—you see these in the news all the time, right? An interest rate is, in a word, 'the price of money.' When it rises and falls, everything shakes: your deposits, your loans, even stocks.
Interest Rate = The Price of Borrowing and Lending Money
An interest rate is the rate you pay for borrowing money (or receive for lending it). When I deposit at a bank, the bank is borrowing my money, so it pays me interest; when I take out a loan, I'm borrowing the bank's money, so I pay interest.
A high interest rate means 'the price of money is expensive.' Borrowing is burdensome, and depositing earns a lot of interest. When rates are low, the opposite is true—borrowing is easy, and depositing earns little.
This simple concept moves the entire economy. When rates rise, people tend to cut spending and investment and increase saving; when they fall, the opposite happens. That's why the interest rate becomes a powerful lever for adjusting the economy and prices.
The metaphor 'the price of money' is the key. An interest rate is both the cost of borrowing money and the reward for having lent it.
The Policy Rate, Market Rates, and Your Investments
The policy rate is the 'benchmark rate' set by a central bank (the Bank of Korea, the U.S. Federal Reserve, etc.). When it's raised or lowered, market rates like deposits, loans, and bonds move in that direction.
In fact, as prices surged, the Bank of Korea began raising the policy rate in the second half of 2021, hiking it to 3.50% by early 2023 (the highest level since 2008). Afterward, as prices calmed, it shifted direction to cuts starting in 2024.
Interest rates have a big impact on investing. When rates rise, (1) interest-paying deposits and bonds become relatively more attractive, (2) the prices of already-issued bonds fall (bond prices and rates move in opposite directions), and (3) growth stocks, which are valued by pulling future profits forward, tend to come under pressure. That's why the 'direction of rates' is a variable investors always watch.
That bond prices and rates move in opposite directions is a point beginners often find confusing. When rates rise, the relative appeal of existing bonds falls, so their prices decline.
Frequently Asked Questions
Q. Why are the policy rate and market rates different?
The policy rate is the 'starting point' set by the central bank, while a market rate is the actual traded rate determined on top of it by maturity, credit quality, and supply and demand. For example, loan rates are higher because the bank's margin and credit risk are added on top of the policy rate. When the policy rate moves, market rates generally follow, but not always by the same magnitude.
Q. When rates rise, do stocks always fall?
Not 'always.' A rate rise is generally a burden on stocks, but in a phase where rates rise because the economy is strong, corporate profits also grow together, and stock prices can hold up. The interest rate is just one of many variables; you can't predict stock prices from a single factor.
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