John QUAH (John Hopkins University)

We formulate a set order on constraint sets which guarantee that linear objective functions on these sets have solutions that vary monotonically in the product order as the constraint set changes with respect to this set order.  Using this result, we characterize the utility/production functions that exhibit complementarity/substitutability in factor demand, normality in factor demand, and marginal costs that increase with factor prices.   In the context of decision-making under uncertainty, our new set order leads to natural generalizations of first order stochastic dominance in multi-prior models.

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