In quantitative finance, we would be lucky to be able to model greed and fear, important factors for high leveraging deal spaces and finally bubble building? But their interdependence has its dynamic in a kind of co-evolution. And greed might be good in some cases (reasonable risk taking)? And it is absolute. But envy is bad, because it is relative (to your"neighbour"). Too much envy in finance?
However, the analysis of such "irrational", "behavioral" factors might become more important. But if, we need to put all our best efforts to analyse them in multi-variant parameter spaces and apply multi-method systems, like mlf on Mathematica .
And I think, Stephen Wolfram's NKS !