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[–] WhiteRonin 0 points 1 point (+1|-0) ago 

People.

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[–] FritzTheKat 0 points 1 point (+1|-0) ago 

The love of money is the root of all evil.

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[–] Vorce 0 points 1 point (+1|-0) ago 

Good.

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[–] ArsCortica 0 points 2 points (+2|-0) ago 

From a behaviorist model, the sexual drive. The latter fuels greed as higher wealth produces higher social standing and therefore a larger number of mating partners. It all goes downhill from there.