The long-run average total cost curve is and is found by using the a. upward-sloping; minimum point across all possible atc curves for a given quantity. b. u-shaped; maximum points along the mc curve at various marginal revenues. c. upward-sloping; maximum points along the mc curve at various marginal revenues. d. u-shaped; minimum point across all possible atc curves for a given quantity.

 A. upward-sloping; minimum point across all possible ATC curves for a given quantity

The long run average total cost curve is U shaped because when production is increased the total average cost starts decreasing because of economies of scale and reach a minimum point at a certain level of production,and after that increasing production will increase the average cost, because dis economies of scale come into effect.

Explanation:

consumer credit. an advantage is that it allows consumers to afford expensive goods and services now, increasing their standard of living. however, a disadvantage is that it creates a trap for debt, if people do not have self control, they may see themselves filing personal bankruptcy.