Perfect Competition

Average Factor Cost Curve, Perfect Competition

A typical average factor cost for perfect competition is displayed in the exhibit to the right. This particular average factor cost curve is that for labor hired by Maggie's Macrame Shoppe. Maggie's Macrame Shoppe is one of thousands of small retail stores in the greater Shady Valley metropolitan area that hires labor with identical skills. As such, Maggie pays the going wage for labor.

The vertical axis measures average factor cost and the horizontal axis measures the quantity of input (workers). Although quantity on this particular graph stops at 10 workers, the nature of perfect competition indicates it could easily go higher.

First and foremost, the average factor cost curve is horizontal at the going factor price of $10. This indicates that if Maggie hires 1 worker, then she pays an average factor cost of $10. Alternatively, if she hires 10 workers, then she pays an average factor cost of $10 per worker. Should she hire 100 workers, then she might move well beyond the graph, but she pays an average factor cost of $10 per worker.

The "curve" is actually a "straight line" because Maggie is a price taker in the labor market. She pays $10 for each worker whether she hires 1 worker or 10 workers or 100 workers. The constant price is what makes Maggie's average factor cost curve a straight line, and which indicates that Maggie has no market control.

Monopsony, Oligopsony, and Monopsonistic Competition

Average Factor Cost Curve, Monopsony

The exhibit to the right displays the average factor cost curve for another hypothetical firm, OmniKing Island Resort. This firm is the only employer of labor on a small tropical island. As the only employer of labor on the Island, OmniKing is a monopsony with extensive market control, and it faces a positively-sloped supply curve. To employ more workers, OmniKing must pay a higher price.

The vertical axis measures average factor cost and the horizontal axis measures the quantity of input (workers). Although quantity on this particular graph stops at 10 workers, it could go higher.

This curve indicates that if OmniKing hires 1 worker (at $6 per worker), then it incurs $6 of average factor cost. Alternatively, if it hires 10 workers (at $15 per worker), then it pays $15 of average factor cost.

This positively-sloped average factor cost curve is actually nothing more than the supply curve facing OmniKing for hiring labor. In the analysis of factor markets, the average factor cost curve and the supply curve facing the firm are almost always one and the same.