At the long-run profit maximizing level for a monopolistic competitor average total costs are Multiple choice question. at their minimum. at their maximum. not at their minimum.Select all that apply The difference between the average total cost curve in a perfectly competitive market and a monopolistically competitive market is that at the long-run profit maximizing level: Multiple select question. the ATC of a perfectly competitive firm is tangent to its demand curve, while the ATC of a monopolistically competitive firm is not. the ATC of a monopolistically competitive firm is tangent to its demand curve, while the ATC of a perfectly competitive firm is not. the ATC of a perfectly competitive firm is at its minimum, while the ATC of a monopolistically competitive firm is not. the ATC of a monopolistically competitive firm is at its minimum, while the ATC of a perfectly competitive firm is not