We address the notion of dynamic, endogenous diversity and its role in theories of investment and technological innovation. We develop a formal model of an innovation arising from the combination of two existing modules with the objective to optimize the net benefits of diversity. The model...

n this paper, we develop two hypotheses: First, regional innovation efforts have a positive impact on regional knowledge based entrepreneurial activity. Second, knowledge based entrepreneurship positively affects regional economic performance. We test these hypotheses using county level data...

This paper examines how a radical technological innovation affects alliance formation of firms and subsequent network structures. We use longitudinal data of interfirm R&D collaborations in the biopharmaceutical industry in which a new technological regime is established. Our findings suggest...

The nature of energy and material resources in an endogenous growth theory framework is clarified. This involves three modifications of the conventional theory. Firstly, multiple feedback mechanisms or “growth engines” are identified. Secondly, a production function distinguishes between...

Which signals are important in gaining attention in science? For a group of 1,371 scientific articles published in 17 demography journals in the years 1990-1992 we track their influence and discern which signals are important in receiving citations. Three types of signals are examined: the...

We analyze the impact of obsolescence of economic inventions by incorporating maintenance costs in the endogenous growth model of expanding product varieties. This contrasts with the existing literature, which ignores maintenance costs and uses the model of quality improvements to describe...

This discussion paper has resulted in a chapter in: (R.U. Ayres, D. Simpson, and M. Toman (eds.)), <I>Scarcity and Growth in the Millennium</I>, 2005, Resources for the Future, Washington DC, 177-97.<P>

Evolutionary and environmental economics have a potentially close relationship. This paper reviews past and identifies potential applications of evolutionary concepts and methods to environmental economics. This covers a number of themes: resource use and ecosystem management; growth and...

Nobel laureates in economics make their most important and creative contributions

Alphabetic name ordering on multi-authored academic papers, which is the convention in the