Share your insights or perspective on the financial matter presented in the input.

What's the difference, if any, between stock appreciation and compound interest?
Compounding is just the notion that the current period's growth (or loss) becomes the next period's principal. So, applied to stocks, your beginning value, plus growth (or loss) in value, plus any dividends, becomes the beginning value for the next period. Your value is compounded as you measure the performance of the investment over time. Dividends do not participate in the compounding unless you reinvest them.  Compound interest is just the principle of compounding applied to an amount owed, either by you, or to you. You have a balance with which a certain percentage is calculated each period and is added to the balance. The new balance is used to calculate the next period's interest, which again adds to the balance, etc. Obviously, it's better to be on the receiving end of a compound interest calculation than on the paying end. Interest bearing investments, like bonds, pay simple interest. Like stock dividends, you would have to invest the interest in something else in order to get a compounding effect. When using a basic calculator tool for stocks, you would include the expected average annual growth rate plus the expected annual dividend rate as your "interest" rate. For bonds you would use the coupon rate plus the expected rate of return on whatever you put the interest into as the "interest" rate. Factoring in risk, you would just have to pick a different rate for a simple calculator, or use a more complex tool that allows for more variables over time. Believe it or not, this is where you would start seeing all that calculus homework pay off!