In The Worldly Philosophers, Robert L. Heilbroner brings this quote from Keynes on the qualifications for an economist. I’ve posted parts of this before, but it is worth repeating:
The study of economics does not seem to require any specialized gifts of an unusual 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 purpose of the future. No part of man’s nature of 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, vet sometimes as near the earth as a politician.