View the model
Download the model

Illustrating how, when there are alternative optima,
   Simplex method chooses an extreme point solution, whereas
   Interior Point/Barrier (without crossover) chooses
      an interior solution that, loosely speaking, is an average
      of all extreme point solutions.
   When there are alternative optima, and there are secondary
   multi-critera, some users may prefer the unique solution of
   the barrier method to the essentially random arbitrary choice
   of one of the extreme point optima.