Plato once defined man to his followers as a featherless biped. Diogenes heard it, caught a chicken and plucked it then brought it to Plato saying, “Here is your man.” I got that story from Jack Sparrow at the Mercenary Trader.
Was Plato wrong? No. Most men walk on two legs and most of us don’t have feathers, but that is a very simplistic model of what constitutes mankind and as a result has very limited application. The humor in the story comes from Diogenes stretching the model beyond its ability to describe the real world and drawing wrong conclusions.
Plucked chicken modeling happens in economics on a regular basis. Economics is about modeling complex events. If the model is too complex it becomes unwieldy and few can understand it. The trend in economics over the past century has been to create extremely simple models. The assumption of equilibrium that forms the foundation of mainstream economics is the most egregious example.