Research Articles -- Duality and existence for a class of mass transportation problems and economic applications -- Functional evolution equations governed by m-accretive operators -- Nonlinear generalizations of theorems on inverse-positive matrices -- Implicit functions and diffeomorphisms without C1 -- Optimization and Lagrange multipliers: non-C1constraints and "minimal" constraint qualification -- Monte Carlo method for pricing of Bermuda type derivatives -- Historical Perspective -- Mathematical economics in Vienna between the Wars.