The Figure Below Depicts the Short-Run Market Equilibrium in a Perfectly

Multiple Choice

The figure below depicts the short-run market equilibrium in a perfectly competitive market and the cost curves for a representative firm in that market. Assume that all firms in this market have identical cost curves. A starting assumption about this industry was that all of the firms in the market had identical cost curves. This assumption is:

A) unrealistic because each firms is unique.
B) realistic because any cost-saving innovation adopted by one firm will be quickly adopted by others.
C) unrealistic because firms closely guard the details of their production processes.
D) realistic because firms rarely seek out cost-saving innovations.