Opportunity cost refers to the potential profit provided by a missed opportunity—the result of choosing one alternative for your money over another.| Investopedia
Purchasing power is the value of a currency in terms of the goods or services one unit of it can buy. Discover how purchasing power impacts investors.| Investopedia
Compound interest is interest that applies not only to the initial principal of an investment or a loan, but also to the accumulated interest from previous periods.| Investopedia