成本曲线.ppt

文档介绍：Chapter Twenty-One
Cost Curves
成本曲线
Structure
Types of cost curves
Fixed, variable and total cost functions
Average fixed, average variable and average cost functions
Marginal cost functions
Marginal and variable cost functions
Marginal and average cost functions
Short run and long run cost curves
Types of Cost Curves
A total cost curve (总成本曲线)is the graph of a firm’s total cost function.
A variable cost curve (可变成本曲线)is the graph of a firm’s variable cost function.
An average total cost curve (平均成本曲线)is the graph of a firm’s average total cost function.
Types 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.
Types of Cost Curves
How are these cost curves related to each other?
How are a firm’s long-run and short-run cost curves related?
Fixed, Variable & Total Cost Functions
F is the total cost to a firm of its short-run fixed inputs (固定投入). F, the firm’s fixed cost, does not vary with the firm’s output level.
cv(y) is the total cost to a firm of its variable inputs (可变投入)when producing y output units. cv(y) is the firm’s variable cost function.
cv(y) depends upon the levels of the fixed inputs.
Fixed, Variable & Total Cost Functions
c(y) is the total cost of all inputs, fixed and variable, when producing y output units. c(y) is the firm’s total cost function;
y
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F
y
$
cv(y)
y
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F
cv(y)