Glossary: Compound interest

This is effectively paying interest on interest. Interest is calculated not only on the initial sum borrowed (principal) or saved (see APR and AER) but also on the accumulated interest. The more frequently interest is added to the principal, the faster the principal grows and the higher the compound interest will be. Compound interest differs from “simple interest” in that simple interest is calculated solely as a percentage of the principal sum.

Relevant to: First-time investor

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