A brief reminder is in order here because from time to time, I do resort to very simple economic models. The utility of simple models in assisting thinking about complex matters is under-appreciated by most of us whose professional interests do not require model-based thinking. In the hard sciences, physicists and cosmologists commonly use models to clarify their thinking and illuminate the essential features of the complex theoretical subjects they study. Where the search space of a solution is unmanageable large, simulations based on simple models come in handy, such as in meteorology.
Elegant models are amazing things. That is why economists do it with models. The study of the real world would be too confusing if it were not stripped of all inessential details. The hard part lies in figuring out which bits to retain and which to discard while creating the model. Model building is an art and the product is often a thing of spectacular beauty and elegance. They illuminate and enlighten; they capture the imagination and make accessible features of the real world that would otherwise be lost in a haze of misapprehension. It seems to me that learning simple models has to be part of a well-rounded education. Children should be exposed to simple models and then taken through the logical deductions that the assumptions imply. But I will not digress into models and our education system for now. What I want to do is quote a passage from Paul Krugman, an economist whom I especially admire for his clarity of thinking and exposition, about how serious economics is done.
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