Answer:
A. Matched Samples
Explanation:
Matched samples is a situation whereby participants are paired, sharing every other characteristics except the one under investigation. The idea behind this is to have more control over unwanted variables. In this case, the study is measuring two production methods and in order to control the unwanted variable and leave only the characteristic or variable under investigation which is the production method, the two method is carried out by the same workers each.
If a monopolist or a perfectly competitive firm is producing at break-even point then they're basically equaling their average revenue to the average total cost - ii.
This basically means that they are operating at a level where the amount which they produce relates to the amount they spend.
