What does curve A in the figure represent? A graph titled Cost Curves is shown with Quantity along the horizontal axis and Cost per unit along the vertical axis. There are four curves shown on the graph. Curve A starts out decreasing, but quickly starts increasing. Curves B and C are U-shaped, with curve C being below curve B. Curve D starts out sharply decreasing, but soon decreases slowly, and continues to decrease at a decreasing rate. Curve D is below curves B and C, and none of these curves intersect. Moving from left to right, curve A first intersects curve D, then curve C, then curve B. All of this occurs as curve A is increasing. average variable costs marginal costs average total costs average fixed costs