Answer to Question #47439 in Microeconomics for John D
Indifference curves (derived from each consumer's utility function) can be drawn in the box for both A and B. The points on, for example, one of B's indifference curves represent equally liked combinations of quantities of the two goods. Hence A is indifferent between one combination of goods and another on any one of her indifference curves, and the same is true for B. There are an infinite number of such curves that could be drawn among the combinations of goods for each consumer.
With B's origin (the point representing zero of each good) at the lower left corner of the Edgeworth box and with A's origin at the upper right corner, typically B's indifference curves would be convex to his origin and A's would be convex to his origin.
When an indifference curve for A crosses one of the indifference curves for B at more than one point (so the two curves are not tangent to each other), a space in the shape of a lens is created by the crossing of the two curves; any point in the interior of this lens represents an allocation of the two goods between the two people such that both people would be better off, since the point is on an indifference curve farther from both of their respective origins.
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