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This paper discusses the impact of housing affordability on the spatial distribution of productivity and wages. The key theoretical contribution is to phrase the problem as an issue of the composition (rather than the level) of housing demand and link it to heterogeneous preferences and characteristics of households. Using a simple simulation methodology, the study estimates levels of amenity values and wages that would make current house prices as affordable as they were in 1995 in all English local authority districts. Although average wages would be unlikely to increase if housing was more affordable, productivity across England would probably be higher as the spatial distribution of economic activity would change. The key conclusions are that (1) unaffordable housing has significant economic implications; and (2) policy aimed at improving housing affordability should consider targeting housing demand as well as supply. [ABSTRACT FROM AUTHOR]

The increasing development of three-dimensional virtual city models and leadingedge computer software applications is providing innovative possibilities for analyzing the performance of existing city-centre public squares. In the design and assessment of city squares, the use of accurate virtual city models is often limited to visual geometrical assessment alone. There is little evidence that such models are being adapted to carry out urban performance simulations. There are, however, existing and emerging tools that can simulate a number of performance aspects—pedestrian movement, noise level, wind movement, and temperature—that show scope for integrating virtual city models to aid in the assessment of public squares. This paper describes a study which investigates the interoperability of off-the-shelf three-dimensional virtual city models to integrate with selected ‘urban performance’ software to contribute to a more integrated approach to the assessment of existing public squares and the future sustainability of virtual city models. Methodologies for utilising virtual city models within ‘urban performance’ software are established, with results demonstrating that the integration of virtual city model data can aid in both the visual and performance assessment of existing public squares, with scope for application to new proposals. The argument is also made that the application of virtual city models in this manner also contributes towards the sustainability of virtual city models, one that takes a more multifunctional approach. This paper acknowledges that the majority of the evaluated software is not related directly to urban design—indeed, there is no software currently available that brings together all the performance aspects and relates them to geometrical characteristics. However, this study offers a significant contribution to this subject and identifies the need for future research into the evolution of information-rich virtual city models. [ABSTRACT FROM AUTHOR]