Fig. 2. Scenarios of tourism development: (a) Butler's diagram (modified from Butler 1980); (b) scenarios obtained with the minimal model 3-5 (parameter values are: r=K=α=β=γ=_S=1, δ=0.1, _E =0.5, a=6, μ _E=μ_S=10, and ε=0.01 in case A, ε=0.25 in case B, and ε=0.45 in case C).