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  How much profit player A makes depends upon both the choice made by Player A and the choice made by Player B. Here we do not assume that the results are zero sum. I.e., we do not assume that any increase in profit for A corresponds to a decrease in profit for B of exactly same amount. This non-constant sum feature is common in decisions involving pricing, advertising, military actions, etc.;
  This version uses complementarity constraints, so the global solver option should be used. Click on:
LINGO | Options | Global solver | Use Global solver