In panel c of Figure 10.5, the joint production possibility frontier is concave to the origin. When the two individual production possibility frontiers are combined, however, the resulting PPF could have been drawn so that it was convex to the origin. How do we know which of these two ways of drawing the PPF to use?
Figure 10.5 Comparative Advantage and Production Possibility Frontiers

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(a) Jane (b) Denise (c) Joint Production MRT =- (Denise) PPF MRT = -2 7MRT =-2 (Jane) 3 PPFd PPF; MRI =- 2 3 6. Candy, Bars Candy, Bars Candy, Bars Firewood, Cords co Firewood, Cords Firewood, Cords