The optimal cost-sharing incentive model of main manufacturer-suppliers for complex equipment under grey information

Based on the uncertainty and grey level of suppliers´ efforts, the paper put forward the incentive strategy of main manufacturer sharing the suppliers´ efforts cost, and established the optimal cost-sharing model under grey effort level. The paper calculated Nash equilibrium and Stackelberg equilibrium under the above incentive model, and came to the optimal proportion, the optimal effort level and the optimal income of main manufacturer sharing the supplier´ development cost. It analyzed that the cooperation status between the main manufacturer and suppliers shifts from Nash equilibrium to Stackelberg equilibrium, and effective cost-sharing incentive program can achieve profits to growth and the effort level of the main manufacturer and suppliers to improve, proving that cooperation between the main manufacturer and suppliers achieves the possibility of Pareto improvement.