PRODUCTIVE ACTIVITY usually is defined as including activities that have economic value in the marketplace. A more contemporary definition of productive activity includes any activity that produces a valued good or service, even if it is not actually paid for.
WARRANTY is a guarantee given to a buyer from a seller that the goods or services purchased will perform as promised, or a refund will be given, repair will be done at no charge, or an exchange made.
INDIFFERENCE POINT is that point on the indifference curve where the compared values intersect. See INDIFFERENCE CURVE.
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