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The risk/reward ratio marks the prospective reward an investor can earn, for every dollar he or she risks on an investment. Many investors use risk/reward ratios to compare the expected returns of an investment with the amount of risk they must undertake to earn these returns. Consider the following example: an investment with a risk-reward ratio of 1:7 suggests that an investor is willing to risk $1, for the prospect of earning $7. Alternatively, a risk/reward ratio of 1:3 signals that an investor should expect to invest $1, for the prospect of earning $3 on his investment.

A standard lot is the equivalent of 100,000 units of the base currency in a forex trade. A standard lot is similar to trade size. It is one of the three commonly known lot sizes; the other two are mini-lot and micro-lot.

The present value of an annuity is the current value of future payments from an annuity, given a specified rate of return, or discount rate. The higher the discount rate, the lower the present value of the annuity.

The present value of an annuity is the current value of future payments from an annuity, given a specified rate of return, or discount rate. The higher the discount rate, the lower the present value of the annuity.

Interest is the charge for the privilege of borrowing money, typically expressed as annual percentage rate (APR). Interest can also refer to the amount of ownership a stockholder has in a company, usually expressed as a percentage.