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Document Page 64 lattice of central places with hexagonal market areas: Lösch vindicated. I am less confident but hopeful that in a model with two or more manufacturing sectors characterized by different scale economies or transport costs the approach will yield Christaller-type hierarchies. I even have a fantasy that in a manysector model there will emerge some deep justification for the rank-size rule, though that may be too much to hope for. The Moral of the Story As you can no doubt tell, I am excited by all of this. But while it was important for me to explain at least briefly the kind of formalization that, to me at least, makes sense of all these spatial economic traditions, the point for these lectures is not to emphasize the specific models that make up my current research. The point is, instead, to realize that in economic geography as in development economics, the unwillingness of mainstream economists to think about what they could not formalize led them to ignore ideas that turn out, in retrospect, to have been very good ones. Central-place theory is a powerful organizing principle for looking at and thinking about urban systems and in only slightly modified form it turns out to make sense in terms of a rigorous economic model. Market potential is an extremely useful empirical concept for measuring market access and it too, in slightly modified form, turns out to make sense in terms of a rigorous model. Circular and cumulative causation is a compelling image that helps you to think about the evolution of regional economies and it is eminently sensible in terms of modern economic models. Yet all of these ideas were essentially exiled from economic theory, if they were ever allowed in in the first place. The file:///D|/Export2/www.netlibrary.com/nlreader/nlreader.dll@bookid=409&filename=page_64.html [4/18/2007 10:30:26 AM]
Document only piece of spatial economics to gain real mainstream acceptance, von Thünen's land-use model, is a thing of beauty; but surely its appeal was more a matter of tractability than of power to explain the world. So what's the moral? We've seen how the insistence on models that meet the standards of rigor in mainstream economics can lead to neglect of clearly valuable ideas. Does this mean that the whole emphasis on models is wrong? Should we make a major effort to open up economics, to relax our standards about what constitutes an acceptable argument? Page 65 No the moral of my tale is nowhere near that easy. Economists can often be remarkably obtuse, failing to see things that are right in front of them. But sometimes a bit of obtuseness is not entirely a bad thing. file:///D|/Export2/www.netlibrary.com/nlreader/nlreader.dll@bookid=409&filename=page_65.html [4/18/2007 10:30:27 AM]
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