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Marginalism and Discontinuity

Tools for the Crafts of Knowledge and Decision
by
Martin H. Krieger
Hardcover
$46.00
6.00 x 9.00 in.
208 pages
November, 1989
ISBN: 978-0-87154-488-9

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Marginalism and Discontinuity is an account of the culture of models employed in the natural and social sciences, showing how such models are instruments for getting hold of the world, tools for the crafts of knowing and deciding. Like other tools, these models are interpretable cultural objects, objects that embody traditional themes of smoothness and discontinuity, exchange and incommensurability, parts and wholes.

Martin Krieger interprets the calculus and neoclassical economics, for example, as tools for adding up a smoothed world, a world of marginal changes identified by those tools. In contrast, other models suggest that economies might be sticky and ratchety or perverted and fetishistic. There are as well models that posit discontinuity or discreteness. In every city, for example, some location has been marked as distinctive and optimal; around this created differentiation, a city center and a city periphery eventually develop. Sometimes more than one model is applicable—the possibility of doom may be seen both as the consequence of a series of mundane events and as a transcendent moment. We might model big decisions or entrepreneurial endeavors as sums of several marginal decisions, or as sudden, marked transitions, changes of state like freezing or religious conversion.

Once we take models and theory as tools, we find that analogy is destiny. Our experiences make sense because of the analogies or tools used to interpret them, and our intellectual disciplines are justified and made meaningful through the employment of characteristic toolkits—a physicist's toolkit, for example, is equipped with a certain set of mathematical and rhetorical models.

Marginalism and Discontinuity offers a provocative and wide-ranging consideration of the technologies by which we attempt to apprehend the world. It will appeal to social and natural scientists, mathematicians and philosophers, and thoughtful educators, policymakers, and planners.

MARTIN H. KRIEGER is associate professor of planning at the School of Urban and Regional Planning, University of Southern California.

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