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"In this paper is presented a comparative survey of the many ways in which a static Leontief input-output model can be extended to include demographic-economic relationships. A family of ten input-output models is identified, with individual members defined according to their representation of household income, employment, and unemployment. Miyazawa's fundamental equation of income formation is generalised and used to establish structural relationships between the models, as reflected in income and employment impact-multipliers. Although the emphasis of the paper is theoretical, examples are given of the empirical application of existing models."

This paper critically examines the idea that planning theory experiences major theoretical shifts. Through a consideration of contributions from several academics, it is shown that different theoretical standpoints in planning persist and coexist. A model is proposed to aid understanding of this situation: the Hydra Model. This model views planning as a discipline in which several standpoints maintain a competitive interaction. This is positive: it is the best way to promote lively dialogue and to develop new understandings. However it is considered negative for planners to adopt a single standpoint. Theories are presented as tools for good practice, not as something to which planners should commit. In aiming for the emergence of this type of planner -an individual capable of flowing from one theory to another according to a discretionary view of particular situations -some suggestions for planning education are presented.

"This article presents a critical survey of research on extended input-output models, emphasizing recent developments in demographic-economic and socio-economic analysis. Basic principles of model design and construction are reviewed, by reference to a representative selection of extended models. Two research themes--labor market analysis and income distribution--are pursued in greater detail as examples of the directions of current work. A comparison is made between extended models and social accounting matrices."

The aim of this article is to demonstrate how a particular modeling framework, based on extended input–output analysis, can be used to obtain a clearer understanding of the impact of regional decline of the effects of high, and rising, unemployment; of falling industrial final demand; of welfare payments; and of declining population. The activity–commodity framework used here provides a systematic way of adding demographic variables to the familiar Leontief interindustry model and the extended inverse derived from it provides a rich source of information about the interaction of demographic and economic change, expressed as demographic–economic and economic–demographic multipliers. Drawing on the author’s research in the 1980s and 1990s, this article considers two empirical examples to show the framework’s analytical value: a simple extended model is used to assess the distributional effects of welfare payments in a declining region; and a more elaborate version is linked to a set of regional labor market accounts, summarizing intercensal change in population and employment. This model is used to produce a comprehensive assessment of the effects of population and employment change in two UK regions, one a growing region (East Anglia) and the other a region in decline (Merseyside). In a final section, the benefits and limitations of the extended input–output modeling framework are discussed in comparison with some of the alternative modeling frameworks that are currently available.