HOUSEHOLD INCOME AND EXPENDITURE IN EXTENDED INPUT-OUTPUT MODELS: A COMPARATIVE THEORETICAL AND EMPIRICAL ANALYSIS*

ABSTRACT At the regional level in-migrant and indigenous workers are likely to have different income levels and consumption propensities. The effects that these differences have upon a local economy are explored within an extended input-output modeling framework. Two iterative input-output models, due to Miernyk et al. and Blackwell, are recast as systems of simultaneous equations and are shown to produce identical results. A detailed analysis is made of model structure and a method is outlined for the decomposition of income multipliers. Empirical versions of the two models, for Boulder and Cork, are reconstructed with data from the original studies and are used to make comparisons of the two local economies.     

A dynamic phase transition model for spatial agglomeration processes

A nonlinear model of population migration is presented in order to provide a dynamic explanation for the formation of metropolitan areas. "In Section 2 the model is introduced in terms of the rate equations for the mean values of the regional population numbers with specifically chosen individual transition rates. Section 3 gives a survey of concepts and results for the convenience of the reader not interested in the details of the mathematical derivations. Section 4 derives the stationary solutions of the rate equations, that is, the equilibria of the system. Section 5 treats the time dependent solutions of the model equations focussing on the exact analytic solutions along so-called symmetry paths. Section 6 analyzes the dynamic stability of the symmetry path solutions and decides which stationary states are unstable and which are stable equilibrium states."     

Life in the Swahili town house reveals the symbolic meaning of spaces and artefact assemblages

Swahili ethnographic information was used to interpret eighteenth-century coral house excavations in Lamu, Kenya. The author was especially interested in learning the symbolic or social meaning of durable objects that were found in archaeological assemblages. It was learned that many of the artefacts found in the excavations are related to rituals performed in Swahili houses. The spaces within the house are ranked and used to teach social position. Features of coral houses, animal remains, infant burials, shells, ceramics, and beads can be shown to have symbolic meaning within the Swahili context.

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Résumé L'auteur a utilisé des informations ethnographiques souahélies afin d'interpréter les fouilles de maisons en corail du 18e siècle à Lamu, Kenya. Elle s'intéressait surtout à connaître la signification symbolique ou sociale des objets non-périssables trouvés dans les assemblages archéologiques. Elle a appris que beaucoup des artefacts trouvés pendant les fouilles sont à rattacher aux rituels célébrés dans les maisons souahélies. Les espaces à l'intérieur de la maison sont classés et utilisés afin de montrer la position sociale. On peut démontrer que certaines particularités des maisons en corail, les restes de faune, les inhumations de tous petits enfants, la céramique et les grains de collier ont des significations symboliques dans leur contexte souahéli.

     

Book Reviews

Understanding the Southern African Crises

Paul Keal, Unspoken Rules and Superpower Dominance. Macmillan, London, 1983, pp.262. $48.00

Roger Hilsman, The Politics of Policy Making in Defense and Foreign Affairs: Conceptual Models and Bureaucratic Politics. Prentice Hall, New Jersey, 1987, pp.ix,326. $42.50.

Benjamin B. Ferencz, A Common Sense Guide to World Peace. Oceana, New York, 1985, pp. xvi + 112. $US15.00.

United Nations, Department of Public Information, The Blue Helmets: A Review of United Nations Peace‐keeping. United Nations, New York, 1985, pp. 361. $US8.96.

United Nations Conference on Trade and Development, The History of UNCTAD 1964–1984. United Nations, New York, 1985, pp. 294.$US5.00.

United Nations, Department for Disarmament Affairs, Co‐ordination and World Disarmament Campaign Section, The United Nations and Disarmament: 1945–1985. United Nations, New York, 1985, pp. 166.$US16.95.

Chris Bellamy, The Future of Land Warfare. Croom Helm, London and Sydney, 1987, pp.xv+326. £29.95.

John Prados, The Soviet Estimate: U.S. Intelligence Analysis & Soviet Strategic Forces. Princeton University Press, Princeton, N.J., 1986, pp.xvi+391. $24.00.

J.W.C. Cumes, The Reconstruction of the World Economy. Longman Cheshire, Melbourne, 1984, pp. 181 $6.91.

Commonwealth Secretariat, Towards a New Bretton Woods: Challenges for the World Financial and Trading System, Report by a Commonwealth Study Group. Longman for the Commonwealth Secretariat, London, 1983, pp. xii + 148. $ 12.95.

Peter Hayes, Lyuba Zarsky and Walden Bello, American Lake. Penguin Books, Ringwood, Victoria, 1986, pp.xiv, 529. $14.95.

A.G. Milner and Trevor Wilson (eds), Australian Diplomacy: Challenges and Options for the Department of Foreign Affairs. AIIA Occasional Paper No. 5, August 1987, pp. 90. $4.50.     

The Influence of Headland Alignment on the Plan Shape of Modelled Zeta-Form Beaches

The east coast of Australia includes many beaches exhibiting a zeta-form or log spiral curve when viewed in plan. It has already been established that there is a relationship between the orientation of such beaches and their curvature. This paper extends understanding by examining the relationship of the upswell headland and the curvature of model beaches. A wave tank model simulates the variation in beach orientation relative to wave approach direction and examines the response in beach curvature to changes in headland alignment.     

PRESIDENTIAL ADDRESS: SUSTAINABLE DEVELOPMENT, THE CHALLENGE

Sustainable development presents a major challenge to geography to demonstrate its capability and relevance to what may be the most important public issue of our time. The human/biosphere relationship is at the core of growing global problems, and geography has comparative advantage in spearheading attempts to make this relationship more sustainable. This paper identifies the components of the challenge, presents a structure which could guide research and implementation efforts, and identifies key opportunities and challenges for geographers through their theoretical and applied work. From definition to integration to implementation, geographers can make a real difference.
Le développement durable est une grande preoccupation de notre temps. C'est au géographe que revient le défi de démontrer que la géographie est une discipline pertinente pour répondre à cette préoccupation. En intégrant les deux éléments de la relation entre l'humanité et la biosphère, qui est souvent au ceur des problèmes de croissance globale, la geographie possède un avantage sur d'autres disciplines pour assurer que cette relation ait un meilleur support. Cet essai présente les composantes de ce défi, le cheminement pour guider la recherche et la mise en œuvre, et identifie les principales opportunités que la géographie appliquée et theorique offre aux géographes. De la définition à l'intCgration et à la mise en oeuvre, la géographe peut apporter beaucoup.