I believe, but cannot prove, that all of the meaningful decision making in the world (from world economics to art trends, to world politics, etcetera) which are often seen as complex processes, are actually influenced by just a small social circle, the one in which the person or group in charge of making that decision are involved.

Or better yet, that most of the perceived complex social, economic or political processes, are actually «decision making» of a small group of influent people, over lunch, on Sundays :)

Comentario en el post de jkottke acerca de lo que uno cree pero no puede probar, al que hice referencia hace unos dias.