Category: Economics

Keynes on what it takes to be an economist:

The study of economics does not seem to require any specialized gifts of an unusually high order. Is it not, intellectually regarded, a very easy subject compared with the higher branches of philosophy or pure science? An easy subject, at which very few excel! The paradox finds its explanation, perhaps, in that the master-economist must possess a rare combination of gifts. He must be mathematician, historian, statesman, philosopher–in some degree. he must understand symbols and speak in words. He must contemplate the particular in terms of the general, and touch abstract and concrete in the same flight of thought. He must study the present in the light of the past for the purposes of the future. No part of man’s nature or his institutions must lie entirely outside his regard. He must be purposeful and disinterested in a simultaneous mood; as aloof and incorruptible as an artist, yet sometimes as near the earth as a politician.

You might say he was describing himself. But he was referring to another master economist: Alfred Marshall.

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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