Types of Cost Curves An average variable cost curve (1 均可变成本曲线) is the graph of a firm's average variable cost function An average fixed cost curve(平均固 定成本曲线) is the graph of a firn’s average fixed cost function A marginal cost curve(边际成本曲线 is the graph of a firm's marginal cost functionTypes of Cost Curves An average variable cost curve （平 均可变成本曲线）is the graph of a firm’s average variable cost function. An average fixed cost curve （平均固 定成本曲线）is the graph of a firm’s average fixed cost function. A marginal cost curve （边际成本曲线 ）is the graph of a firm’s marginal cost function