ET. In order to prevent the healthy plant population going to extinction, we further propose a bi-threshold-value model … spaces, the infected plant free periodic solution is globally stable for the bi-threshold-value model. The modeling methods …

and asymptotically stable equilibrium. There exists a threshold value on the initial number of firms to be overcome it to …) coexisting with a share of unskilled workers. But if the initial share of innovative firms is lower than the threshold value …