Compound Interest

money · math · growing wealth · super smart

Interest makes interest. When you earn interest on money in a bank, that interest gets added to your original amount. Then next time, you earn interest on the bigger total, not just your original money. This creates a snowball effect where your money grows faster and faster over time.

The longer you wait. Compound interest rewards patience. If you leave your money untouched for a long time, the compounding effect gets stronger. A small amount of money left for 30 years can grow to an impressive sum, just because of compound interest doing its work year after year.

Banks use it too. When you borrow money from a bank, compound interest works against you. The bank adds interest to your debt, and then charges interest on that interest. This is why paying back loans quickly saves you money, because less compounding happens.

Albert Einstein loved it. The famous scientist Albert Einstein supposedly called compound interest the eighth wonder of the world because of how powerfully it works. Even small interest rates create huge growth over many decades, which is why starting to save early is so smart.

Time is your superpower. The most important ingredient in compound interest is time, not the amount of money. A teenager who saves $100 and leaves it alone for 50 years might end up with more money than an adult who saves $1,000 for only 10 years.