LRAC (long-run average cost curve) refers to the curve determining the minimal cost per unit of a given product in various output levels, assuming that production factors are kept constant. The curve is used by firms to determine the cost incurred when producing a given quantity in the long run. Economies of scale play a significant role in the LRAC since an increase in production scale reduces the products' average costs. Lower average costs illustrate that the company achieves production efficiency and has the upper hand while competing with other firms in the market. Moreover, a decrease in the LARC implies that the internal economies are exploited in the company.

Average Cost:

The average cost is acquired by dividing the number of units from the total cost (AC=TC/Q). Average costs are a fundamental component in the demand and supply and also affect the supply curve. Moreover, they determine the cost of the product per unit in the market.