In this section, we illustrate some numerical solutions of model 2 for di¤erent values of the parameters to compair
it with the qualitative results.We use the following parameters: = 025 = 04 and = 023. For 0 1we
use = 02 = 004 and = 03 and for > and > , we use = 05, = 012 and = 01 We use the following di¤erent initial values such that + + + = 1: