"Colleges don't teach economics properly. Unfortunately we learn little from the experience of the past. An economist must know, besides his subject, ethics, logic, philosophy, the humanities and sociology, in fact everything that is part of how we live and react to one another."

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One of the most important skills of the economist, therefore, is that of simplification of the model. Two important methods of simplification have been developed by economists. One is the method of partial equilibrium analysis (or microeconomics), generally associated with the name of Alfred Marshall and the other is the method of aggregation (or macro-economics), associated with the name of John Maynard Keynes.

— Kenneth E. Boulding