### Time Line

A horizontal line on which time zero appears at the leftmost end and future periods are marked from left to right; can be used to depict investment cash flows.

### Mixed Stream

A stream of cash flow that is not an annuity; a stream of unequal periodic cash flows that reflect no particular pattern.

### Future Value

The value at a given future date of an amount placed on deposit today and earning interest at specified rate.

### Compound Interest

Interest that is earned on a given deposit and has become part of the principal at the end of a specified period.

### Present Value

The current dollar value of a future amount, the amount of money that would have to be invested today at a given interest rate over a specified period to equal the future amount.

### Annuity

A stream of equal periodic cash flows over a specified time period. These cash flows can be inflows of returns earned on investments or outflows of funds invested to earn future returns.

### Continuous Compounding

Compounding of interest an infinite number of times per year at intervals of microseconds.

### Nominal (Stated) Annual Rate

Contractual annual rate of interest charged by a lender or promised by a borrower.

### Annual Percentage Rate (APR)

The nominal annual rate of interest, found by multiplying the periodic rate by the number of periods in one year, that must be disclosed to consumers on credit cards and loans as a result of "truth-in-lending laws."

### Annual Percentage Yield (APY)

The effective annual rate of interest that must be disclosed to consumers by banking on their savings products as a result of "truth-in-savings laws."

### Loan Amortization

The determination of the equal periodic loan payments necessary to provide a lender with a specified interest return and to repay the loan principal over a specified period.