Research on the Moderate Scale of 7-11 and Meiyijia, Based on Different Symbiosis Modes --Taking Shanghai as An Example

In order to determine the appropriate scale of new retail stores of Japanese brands and Chinese local brands, promote the healthy development of the two types of convenience stores, and provide more convenient services for urban residents. First, based on the principle of co-evolution, 7-11 and Meiyijia are taken as representatives of two different types of convenience stores to establish Lotka-Volterra evolution models of them. Then, the stable points in the evolution model are determined according to the Jacobian matrix and assigned according to different co-evolution modes and stability conditions. Finally, numerical simulation is performed using data from these two stores in Shanghai. The results show that the evolution of 7-11 and Meiyijia is related to the symbiosis coefficient between them, and neither of them can reach their scale threshold in the competitive environment. However, both of them have larger development space and can reach their scale threshold in the mutualistic symbiosis environment. Therefore, it puts forward the suggestion that the two should strengthen cooperation and development to provide a more convenient life for residents.