1,721,253 research outputs found
Computational Methods in Economic Dynamics
Full text linkDawid H, Semmler W, eds. Computational Methods in Economic Dynamics. Berlin, Heidelberg: Springer; 2011
The role of demand in fostering product vs process innovation: a model and an empirical test
Full text linkDawid H, Pellegrino G, Vivarelli M. The role of demand in fostering product vs process innovation: a model and an empirical test. Journal of Evolutionary Economics. 2021;31:1553-1572
Gaining the Competitive Edge Using Internal and External Spillovers: A Dynamic Analysis
No full textBischi G-I, Dawid H, Kopel M. Gaining the Competitive Edge Using Internal and External Spillovers: A Dynamic Analysis. Journal of Economic Dynamics and Control. 2003;27(11-12):2171-2193.This paper studies the evolution of two clusters of firms competing on a common market. Firms exit and enter a cluster based on the perceived chances for profits inside and outside the cluster. Information about profits are diffused by direct communication between firms. Internal and external spillover effects reduce the overall costs of firms in the clusters depending on the number of firms in the own and the competing cluster. A discrete time deterministic dynamical system describing the evolution of cluster sizes is derived. An analysis of the long run attractors of the system and their basins of attraction is used to compare the effects of advantages of a cluster with respect to the size of internal and external spillover effects, respectively. Furthermore, the implications of slow and fast exit and entry behavior of firms for the long run survival and the size of the clusters are studied
A new species of Himacerus from South Africa (Hemiptera: Heteroptera: Nabidae)
No full textKerzhner, Izyaslav M., Jacobs, Dawid H. (2008): A new species of Himacerus from South Africa (Hemiptera: Heteroptera: Nabidae). Zootaxa 1819: 63-67, DOI: 10.5281/zenodo.18297
FIGURES 4–7 in A new species of Himacerus from South Africa (Hemiptera: Heteroptera: Nabidae)
No full textFIGURES 4–7. Himacerus frater sp. nov. 4, paramere. 5, aedeagus. 6, vagina, dorsal. 7, vagina, ventral.Published as part of Kerzhner, Izyaslav M. & Jacobs, Dawid H., 2008, A new species of Himacerus from South Africa (Hemiptera: Heteroptera: Nabidae), pp. 63-67 in Zootaxa 1819 on page 66, DOI: 10.5281/zenodo.18297
Computational Intelligence in Economic Games and Policy Design
No full textDawid H, La Poutre H, Yao X. Computational Intelligence in Economic Games and Policy Design. IEEE COMPUTATIONAL INTELLIGENCE MAGAZINE. 2008;3(4):22-26
Skiba phenomena in Markov perfect equilibria of asymmetric differential games
No full textThis paper examines the existence of Markov-Perfect-Equilibria that give rise to coexisting locally stable steady states in asymmetric differential games. The strategic interactions between an incumbent in a market and a potential competitor, which tries to enter the market through product innovation, are considered. Whereas the potential entrant invests in the build-up of a knowledge stock, which is essential for product innovation, the incumbent tries to reduce this stock through interference activities. It is shown that in the presence of upper bounds on investment activities of both firms a Markov-Perfect-Equilibrium exists under which, depending on the initial conditions, the knowledge stock converges either to a positive steady state, thereby inducing an entry probability of one, or to a steady state with zero knowledge of the potential entrant. In the later case the entry probability is close to zero. It is shown that this Markov-Perfect-Equilibrium is characterized by a discontinuous value function for the incumbent and it is discussed that this feature is closely related to the existence of upper bounds on the investments of the players. Removing these constraints in general jeopardizes the existence of a Markov-Perfect-Equilibrium with multiple locally stable steady states
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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