Towards commercial and environmental excellence: A green portfolio matrix

This article examines the strategic framework and options available for product strategy towards commercial and environmental excellence. It defines the environmental dimension as a ‘moving target’, explores a conceptual framework to integrate commercial and environmental dimensions and elaborates a ‘green portfolio matrix’. The proposed matrix is also empirically investigated as to its practical validity by using a set of secondary data including twelve product cases. Using the matrix, a company can diagnose its existing product mix from an environmental point of view, and furthermore can establish future ‘targets’ for an environmentally-friendly product portfolio. In addition, the matrix can be used as a framework for comparative analyses between strategic business units or for longitudinal assessment of a specific business entity.     

The Bias Due to Omitting Income When Estimating Demand Functions

This paper obtains an expression of the bias when relevant explanatory variables are omitted in seemingly unrelated regression (SUR) models. A simple demand system is provided to illustrate the direction of the bias terms when a variable is omitted.
L'article permet d'exprimer le biais qui résulterait de l'omission de variables explicatives pertinentes dans des modéles de régression sans corrélation apparente (SUR). Le système de demande simple qui est présente ici met en évidence le sens des éléments de biais lorsqu'on omet une variable.     

Using census and survey commuting statistics in local labour market analysis

This paper describes the context for an interest in travel-to-work patterns by those concerned with labour market analysis and local economic development. The scope, coverage and content of Census of Population and local survey data on travel-to-work patterns are reviewed, and their strengths and weaknesses compared. Examples of the types of information which can be extracted from various sources are used to illustrate similarities and variations in travel-to-work patterns by population subgroup, and analyses on travel-to-work times and the geographical extent of job search areas derived from local labour force surveys are presented.