A Generalization of the Grey Lotka–Volterra Model and Application to GDP, Export, Import and Investment for the European Union

Mihaela Sterpu, Carmen Rocșoreanu, Georgeta Soava () and Anca Mehedintu
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Mihaela Sterpu: Department of Mathematics, University of Craiova, 200585 Craiova, Romania
Carmen Rocșoreanu: Department of Statistics and Economic Informatics, University of Craiova, 200585 Craiova, Romania
Georgeta Soava: Department of Statistics and Economic Informatics, University of Craiova, 200585 Craiova, Romania
Anca Mehedintu: Department of Statistics and Economic Informatics, University of Craiova, 200585 Craiova, Romania

Mathematics, 2023, vol. 11, issue 15, 1-23

Abstract: This study proposes a generalized grey Lotka–Volterra model with a finite number of variables. The model is obtained by applying the grey modelling method to estimate the parameters of a finite dimensional quadratic Lotka–Volterra system. Subsequently, the model is used to analyze the competition and cooperation relationship between four macroeconomic indicators, namely Gross Domestic Product, Export, Import and Investment, and to obtain short-time forecasting for them. The data used in the empirical investigation cover the time periods 2005–2022 and 2011–2022, for the European Union. The empirical results are compared to the ones obtained by using the grey model G M ( 1,1 ) and the two-dimensional grey Lotka–Volterra model. Finally, economic interpretations of the empirical findings are formulated.

Keywords: grey model; generalized grey Lotka–Volterra model; gross domestic product; export; import; investment; EU (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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