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Research Articles: G. Carlier, Duality and existence for a class of mass transportation problems and economic applications; Charles Castaing and Ahmed Gamal Ibrahim: Functional evolution equations governed by m-accretive operators; Leonid Hurwcz and Marcel K. Richter, Implicit functions and diffeomorphisms without C; Leonid Hurwicz and Marcel K. Richter, Optimization and Lagrange multipliers: Non-C1 Constraints and minimal constraint qualifications; Takao Fujimoto, Jose A. Silva and Antonio Villar, Nonlinear generalizations of theorems on inverse-positive matrices; Shigeo Kusuoka, Monte Carlo method for pricing of Bermuda type derivatives.- Historical Perspectives: Isao Mutoh, Mathematical economics in Vienna between the wars.- Subject index.