What is one of the primary characteristics of perfectly competitive markets?

they have relatively high barriers to entry.

they have relatively high start-up costs.

they are relatively inefficient.

they are relatively efficient.

They are relatively efficient is one of the primary characteristics of perfectly competitive markets

Explanation:

A perfectly competitive market is a speculative market where competition is at its most noteworthy conceivable level. Neo-old style financial experts contended that the ideal challenge would deliver the most excellent results for customers and society.

Here is perfect knowledge, with no failure of information or time slacks in the progression of data. Learning is uninhibitedly accessible to all members, which implies that hazard taking is insignificant, and the job of the business visionary is constrained.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

answer; being clearly political;