Abstract
We explore the relationship between export variety and economic development, using data on OECD countries between 1964 and 2003. We show that structural change in the world economy has a particular arrow of time leading to a growing variety of exports. Distinguishing between related variety (within sectors) and unrelated variety (variety between sectors), we also show that related variety stimulates growth instantaneously, while unrelated variety only promotes growth with a considerable time lag. This finding is in line with the evolutionary notions that economic development and international trade patterns are path dependent.
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Notes
Factor endowments are generally acknowledged to be important determinants of economic development through their effect on export specialization patterns. However, effects of endowments on the rate of development are expected to be minor, and to decrease in the future as economic development becomes increasingly knowledge-based.
It must be pointed out that, in this context, variety can be used at a higher level of aggregation than the traditional one prevalent in much of the economic literature on the subject (Dixit and Stiglitz 1977; Lancaster 1975). While traditionally variety measured the degree of differentiation of a product group, in the present paper it is used to measure the degree of differentiation of economic systems at different levels of aggregation, starting from a firm or an individual product and ending with the world economy. In this paper, then, variety is a measure of the extent of differentiation of the economic system as a whole.
The claims that (1) the variety of economic system has grown, and, (2) has to grow in order to allow the further development of the system, find support in the endogenous growth literature. Amongst recent endogenous growth models, those by Romer (1990) contribute to the debate about variety by assuming that R&D activities create new types of capital goods which then accumulate in the economy. Although Romer does not use explicitly the concept of variety, in his models at least the variety of capital goods is bound to increase during the process of economic development. This model has also motivated some empirical research testing the relationship between variety and economic growth using employment data (Funke and Ruhwedel 2001a).
An approximate demonstration of this proposition is given in Saviotti (2003). There it is shown that developing countries have different catch up strategies, based on a mixture of specialization, variety growth and entry into different niches. The success of these strategies can be expected to depend among other variables on the previous production structure of the country and on the time span over which the strategy is applied. At this point, it is important to introduce the distinction between related and unrelated variety.
The trends for Norway can be explained by its specialization in oil and fisheries, and the trends for Ireland by the specialization in computers and pharmaceuticals after the 1980s following an initial growth of export variety.
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Acknowledgment
Comments by Frank Neffke are gratefully acknowledged. All errors remain ours.
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Appendix
Appendix
Annex
Source: OECD trade databases
AUS is Australia
CAN is Canada
CHE is Switzerland
DEU is Germany
DNK is Denmark
ESP is Spain
FIN is Finland
FRA is France
GBR is Great Brittain
GRC is Greece
IRL is Ireland
ITA is Italy
JPN is Japan
NLD is Netherlands
NOR is Norway
NZL is New Zealand
PRT is Portugal
SWE is Sweden
TUR is Turkey
USA is USA
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Saviotti, P.P., Frenken, K. Export variety and the economic performance of countries. J Evol Econ 18, 201–218 (2008). https://doi.org/10.1007/s00191-007-0081-5
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DOI: https://doi.org/10.1007/s00191-007-0081-5