What Is the Federal Reserve and How Does Monetary Policy Work?
The Federal Reserve is the central banking system of the United States. Its dual mandate from Congress is to promote maximum employment and maintain price stability by keeping inflation near a target 2% annual rate.
The primary lever used by the Federal Open Market Committee (FOMC) is the target range for the Federal Funds Rate. When the Fed raises rates to curb inflation, borrowing costs rise across credit cards, auto loans, and mortgages, while bank savings yields increase.
Simple vs. Compound Interest: The Exponential Growth Curve
Simple interest calculates returns solely on the initial principal. Compound interest calculates interest on the principal plus all previously accumulated interest, creating an exponential growth acceleration curve over long horizons.
For example, a $10,000 investment at 8% annual compound interest grows to $46,610 over 20 years, whereas simple interest yields only $26,000 over the same timeframe. The frequency of compounding (daily, monthly, annually) further amplifies total return capability.
Quick Interest Calculator
Test the math live: calculate returns for any principal balance, rate, and term.
Final Investment Value: $49,268.03
Total Interest Earned: $39,268.03
APR vs. APY: Comparing Borrowing Costs and Savings Returns
While APR (Annual Percentage Rate) and APY (Annual Percentage Yield) look similar, they measure interest costs under different compounding rules required by federal consumer protection laws.
APR is standard for loans and credit cards. It represents simple interest plus upfront lender fees over a year. APY is standard for savings accounts and certificates of deposit (CDs), capturing the true total annual yield after compounding interest is factored in.
