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Hellwig, Martin
Year of Publication: 
Series/Report no.: 
Preprints of the Max Planck Institute for Research on Collective Goods 2008,4
The paper develops a version of Pontryagin's maximum principle for optimal control problems with monotonicity constraints on control variables. Whereas the literature handles such constraints by imposing an assumption of piecewise smoothness on the control variable and treating the slope of this variable as a new control variable subject to a nonnegativity constraint, the paper obtains the maximum principle without such an additional assumption. The result is useful for studying incentive problems with hidden characteristics when the type set is a continuum and preferences satisfy a single-crossing constraint.
Maximum Principle
Optimal Control
Monotonicity Constraints
Incentive Problems with Hidden Characteristics
Document Type: 
Working Paper

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