Economic Definition of LRAC. Defined.
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Term LRAC Definition: The abbreviation for long-run average cost, which is the per unit cost of producing a good or service in the long run when all inputs are variable. In other words, long-run total cost divided by the quantity of output produced. Long-run average cost is based on economies of scale (or increasing returns to scale) and diseconomies of scale (or decreasing returns to scale).