Figure 13-1 shows the Stackelberg model of a duopoly.Both firms face constant marginal costs equal to OJ and the market demand curve is AD.The Stackelberg firm produces an output of OF and OF is equal to FL. 
-Refer to Figure 13-1.The difference between the total industry output produced under a perfect competition model and a Stackelberg model is represented by the distance _____.
Definitions:
Vagina
A muscular tube leading from the external genitals to the uterus in women and female mammals, involved in sexual intercourse and childbirth.
Fallopian Tube
A pair of tubes along which eggs travel from the ovaries to the uterus; a key site for fertilization.
Vascularity
The degree to which tissues are supplied with blood vessels, crucial for the delivery of oxygen and nutrients and the removal of waste products.
Clitoris
A sensitive organ located in the female genitalia, involved in sexual pleasure.
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