solved div0 error when all defective

        set tmp-sum-coef max-new-values / (sum-generated-value - boss-reaction-time * own-performance)

      ]

      let tmp-coop-coef 0

      if number-of-cooperation + number-of-defects > 0 [

      let tmp-coop-coef 1

      if number-of-cooperation > 0 [

        set tmp-coop-coef (number-of-cooperation / (number-of-cooperation + number-of-defects)) / max-new-cooperations

      ]