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The paper shows differences between social and natural sciences, specifically between those most closely involved, economics and biology, that help to account for the very different conclusions. These include the longer term perspective and the sense of contingency on the part of biologists, along with the view that mankind has arrived where it now is by adapting to the natural world, as against the shorter term interests, the intervention of the consciousness of participants, and the view that mankind is creative and not merely adaptive on the part of economists. For economists growth is now the normal condition; for biologists it is an aberration -- an admirable one up to a point -- of the last century or two.</abstract>
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