This paper introduces heterogeneity of cross-technologies interactions into the double-differentiated R&D-based endogenous growth model. In this model new technologies appear continuously and older are outdated generating structural change. All technologies may interact with each other through...

In many countries, inducing large-scale technological changes has become an important policy objective, as in the context of climate policy or energy transitions. Such large-scale changes require the development of strongly interlinked technologies. But current economic models have little...

In this paper discrete wavelet filtering techniques are applied to decompose macroeconomic data so that they can be simultaneously analyzed in both the time and frequency domains. The MODWT (Maximal Overlap Discrete Wavelet Transform) is applied to U.S. quarterly GDP data from 1947–2012 to...

We study a Ramsey problem in in¯nite and continuous time and space. The problem is discounted both temporally and spatially. Capital flows to loca- tions with higher marginal return. We show that the problem amounts to optimal control of parabolic partial differential equations (PDEs). We rely...

The purpose of this paper is to derive necessary conditions for the optimal control in the presence of threshold effects when the threshold is a curve in n-dimensional space of uncertain location. The usefulness of these conditions is shown by examining the optimal regulation of two greenhouse...

En este trabajo presentamos un modelo de crecimiento económico y contaminación, que incorpora un sector de investigación en tecnologías menos contaminantes. Además, a diferencia de otros modelos propuestos en este contexto, incluye la posibilidad de destinar parte del capital existente a la...

The most influential explanations of economic growth along the past five decades rely on two main items: human capital accumulation and the dissemination of knowledge/technological diffusion. These items traditionally appear as separate growth sources. In this paper an integrated perspective is...

Qualitative properties of optimal investment strategies for a firm with quadratic costs and non-concave revenues are analysed. Organising information in a bifurcation diagram, it is found that the organising centre of the diagram is a so-called swallow-tail singularity. This implies the...

In this paper an analytical framework using robust control was developed for the one-state and one-control variable model to examine the response of the control to changes in the "free" parameter. However, in contrast to Gonzalez and Rodriguez (2003), the sign of the ``free" parameter in the...