Inflation is a decrease in the purchasing power of money, reflected in a general increase in the prices of goods and services in an economy.| Investopedia
A stock, also known as a share, is a tradable claim to fractional ownership of the corporation that issued it.| 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