COST EFFECTIVE is when a judgment is made that something is economical in terms of the goods or services received for the money spent.
CASH DISCOUNT is a refund of some fraction of the amount paid because the purchase price is paid by the buyer in cash, as opposed to making the purchase on credit or, sometimes, credit card or check.
DISCOUNTED EARNINGS determines the value of a business based upon the present value of projected future earnings, discounted by the required rate of return (capitalization rate). Usually, the question is how well earnings are projected.
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