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Abstract and Applied Analysis
Volume 2014 (2014), Article ID 686274, 8 pages
Research Article

Hopf Bifurcation Analysis in a Modified Price Differential Equation Model with Two Delays

School of Science, Tianjin Polytechnic University, Tianjin 300387, China

Received 14 November 2013; Accepted 13 January 2014; Published 3 March 2014

Academic Editor: Weiming Wang

Copyright © 2014 Yanhui Zhai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The paper investigates the behavior of price differential equation model based on economic theory with two delays. The primary aim of this thesis is to provide a research method to explore the undeveloped areas of the price model with two delays. Firstly, we modify the traditional price model by considering demand function as a downward opening quadratic function, and supply and demand functions both depending on the price of the past and the present. Then the price model with two delays is established. Secondly, by considering the price model with one delay, we get the stable interval. Regarding another delay as a parameter, we studied the linear stability and local Hopf bifurcation. In addition, we pay attention to the direction and stability of the bifurcating periodic solutions which are derived by using the normal form theory and center manifold method. Afterwards, the study turns to simulate the results through numerical analysis, which shows that the provided method is valid.