The IPAT-model developed by Ehrlich and Holdren is widespread in ecological economics in order to quantify the impact of population growth on environmental deterioration. We comment on this model and extensions proposed by several authors from a theoretical and empirical point of view.

In this paper, we investigate the external effects of the parent's decisions on the number of newly born children and the firm's decisions on the amount of polluting emissions that occur in industrial production. We employ an optimal control model which comprises three stock variables...

Population growth is often viewed as a most oppressive global problem with respect to environmental deterioration, but the relationships between population development, economic dynamics and environmental pollution are complex due to various feedback mechanisms. We analyze society’s economic...

We analyze the optimal dynamic scale and structure of a two-sector-economy, where each sector produces one consumption good and one specific pollutant. Both pollutants accumulate at different rates to stocks which damage the natural environment. This acts as a dynamic driving force for the...

Dieser Aufsatz reflektiert das Verständnis von Mensch und Natur, welches dem Denken von Malthus zugrunde liegt und kontrastiert es mit dem völlig anderen Verständnis seines Zeitgenossen William Wordsworth. Wir zeigen, dass die ökonomischen Überlegungen beider entscheidend durch diese...

In this paper the view of humankind and nature upon which the thinking of Malthus is founded will be reflected on and contrasted with the opposed understanding of his contemporary Wordsworth. We show that the economic considerations of both are based decidedly on the premise of these views, and...