Learn the impact of nominal, real, and effective interest rates on investors and borrowers, including inflation's role and the cost of compounding.

Don't let flashy low rates fool you. To find a loan's true cost, calculate the Effective Interest Rate (APR), which includes compounding frequency and hidden fees. This ensures a fair comparison.

is—it’s effectively a percentage of an amount over a year. If your savings account earns you a 0.05% interest per year (which is a really terrible interest rate, honestly), you earn $5 in interest for ...