Contract curve-Curve showing all efficient allocations of goods between two consumers,or of two inputs between two production functions. The contract curve contains all allocations for which consumers'indifference curves are tangent. Every point on the curve is efficient because one person cannot be made better off without making the other person worse off. Contract curve-Curve showing all efficient allocations of goods between two consumers, or of two inputs between two production functions.  The contract curve contains all allocations for which consumers’ indifference curves are tangent. Every point on the curve is efficient because one person cannot be made better off without making the other person worse off