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Dynamics of entry and exit of product varieties: What evolution dynamics can account for the empirical regularities?
KTH, School of Architecture and the Built Environment (ABE), Centres, Centre of Excellence for Science and Innovation Studies, CESIS (closed 20110701). Jönköping International Business School, Sweden .
2011 (English)In: Nonlinear Economic Dynamics, Nova Science Publishers, Inc., 2011, 155-174 p.Chapter in book (Refereed)
Abstract [en]

Firm-level heterogeneity is substantial even in narrowly defined industries. This chapter focuses on formulating evolution dynamics which can account for the observed heterogeneity and its maintenance. Based on examination of data on Swedish firms' supply pattern across different markets over time, we present a parsimonious model that has the ambition to capture the picture of heterogeneous firms, while accommodating the simultaneous exit and entry of destination varieties in firms' supply pattern. The model assumes both scale economies of firms and path-dependence, where the latter is manifested in such a way that the arrival rate of innovation ideas to an individual firm is a function of each firm's stock of varieties at every given point in time. The path-dependence phenomenon is an "explosive" non-linearity, whereas conservation mechanisms include development of demand and exit of established varieties. The described path dependence explains the skewed distribution of varieties across firms. Exit of obsolete varieties and growth of demand keep the "equilibrium" away from competitive exclusion where only few large firms remain. We make use of simulations to depict and assess the innovation dynamics of the proposed model.

Place, publisher, year, edition, pages
Nova Science Publishers, Inc., 2011. 155-174 p.
National Category
Economics and Business
URN: urn:nbn:se:kth:diva-163005ScopusID: 2-s2.0-84896438244ISBN: 9781616687885OAI: diva2:804943

QC 20150414

Available from: 2015-04-14 Created: 2015-03-26 Last updated: 2015-04-14Bibliographically approved

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