Because market price always tends back to the minimum average total cost for all identical firms in a perfectly competitive market in the long run,in theory:

Question

Quizplus · Accepted Answer

In a perfectly competitive market, firms will produce at the minimum average total cost in the long run, which means that they will sell at the market price. As the market price is determined by the intersection of supply and demand, and all firms are producing at the same minimum average total cost, the market price will be the same at any quantity (assuming no changes in demand). Therefore, the best answer is B: price will be the same at any quantity.

Because Market Price Always Tends Back to the Minimum Average