mint&machine

Most people have a bank account, but I don’t think most people actually know what a bank does.

If I asked someone what a bank is, they’d probably say, “It’s where I keep my money.” That’s what I used to think too. But after looking into it, I realized that banks do much more than store money. They help people make payments, provide loans, protect deposits, and keep money moving throughout the economy.

According to the FDIC’s 2023 National Survey of Unbanked and Underbanked Households, about 96% of U.S. households had at least one bank or credit union account. That means almost everyone interacts with the banking system in some way, whether it is receiving a paycheck, using a debit card, paying a bill online, or keeping money in a savings account.

But storing and transferring money is only part of what banks do.

Imagine you have $5,000 sitting in a savings account. Maybe you’re saving for college, a car, or something years down the road. At the same time, someone else wants to open a small business but doesn’t have enough money to buy equipment. Somehow, both people can be helped by the same bank.

That made me wonder: how?

Banks don’t keep every deposited dollar sitting in a vault collecting dust. Instead, they use deposits and other funding to support loans while managing their money so customers can still make withdrawals. Your exact dollars are not handed to one specific borrower, but deposits help provide the stable funding banks need to lend.

Those loans help people buy homes, pay for college, purchase cars, and start businesses. A business owner who might otherwise need to save for years can borrow money, buy equipment, and begin operating much sooner. In that way, banks help turn money that might sit unused into spending, investment, and economic activity.

This is where interest comes in.

Interest is the price of using money over time. If you borrow money from a bank, you pay interest because you are receiving money now and promising to repay it later. The bank also takes the risk that you may not repay everything you owe.

If you keep money in a savings account, the bank may pay you interest in return. What I found interesting is that interest works differently depending on which side of the transaction you’re on. When you’re borrowing, it increases the total amount you must repay. When you’re saving, it can slowly grow your balance.

Imagine you deposit $100 into a savings account. Your account still shows that the full $100 belongs to you, but your deposit also becomes part of the bank’s overall funding. Somewhere else, the bank may approve a car loan. The borrower pays interest, and part of that income helps the bank pay savers, cover expenses, and prepare for possible losses.

So why doesn’t the bank charge borrowers the same interest rate it pays savers?

Banks are still businesses. They have employees to pay, technology to maintain, fraud to prevent, and risks to manage. Because of that, they usually charge borrowers a higher rate than they pay savers. The difference between those rates is one of the main ways banks earn money.

Interest rates also affect the entire economy.

You’ve probably heard someone on the news say, “The Federal Reserve raised interest rates.” I always knew that sounded important, but I never completely understood why. When rates are low, borrowing becomes cheaper, so people may be more willing to buy homes or cars, while businesses may borrow to expand. This can encourage spending and economic growth.

When rates rise, borrowing becomes more expensive. Consumers may spend less, and businesses may delay investments. That can slow the economy and reduce some of the pressure causing prices to rise. This is why changing interest rates is one of the Federal Reserve’s main tools for controlling inflation and keeping the economy stable.

Even if you’re still in high school, banks probably affect your life more than you realize. Maybe you have a checking account for your first job, a savings account your parents opened years ago, or you’re thinking about getting your first credit card. Every one of those decisions connects you to the banking system.

However, simply having a bank account does not automatically make someone financially secure. Banks are tools. They can help you save, borrow, transfer money, and work toward future goals, but what matters most is how you use them.

The more I learn about economics, the more I realize that banks are much more than places to store money. They allow people to make everyday payments, provide financing, help businesses grow, and keep money moving throughout the economy. Once you understand that, you start seeing banks as one of the foundations of the entire financial system.