"You can find that sort of regularity in Stock Exchange quotations. [Expressing his lack of confidence in reported regularities in the periodic classification of elements.]"

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[In science any model depends on a pre-chosen taxonomy] a set of classifications into which we divide the enormous complexity of the real world... Land, labor, and capital are extremely heterogeneous aggregates, not much better than earth, air, fire, and water.

— Kenneth E. Boulding