This research has the objective to utilize equation system of rubber demand and input-output table to study impact of economic from the rubber demand change, to study stability of rubber price, the appropriateness for investment of rubber planting and the appropriate age for rubber replacement. The result of this research in part of the impact of world rubber demand by analyzing from Thailand’s equation system of rubber demand indicates that when the world rubber demand increases, domestic consumption of rubber in other rubber products industry get the most impact. The second is exports of rubber to Japan and the third is exports of rubber to China. Besides the analysis of impact of the other sector in economic from the increasing final rubber demand at various percentage indicates the rubber planting has the highest increasing of value added. The later are crepe rubber production and other rubber products production. The analysis of Linkages indicate rubber planting has high forward linkage but crepe rubber production, type production and other rubber products production have high backward linkage. The analysis of stability price for rubber indicates wholesale price is the most instabilize. The monthly average price is more stabilize than the annual average price. Benefit-cost ratio at discount rate 9% of the average yield rubber and the highest yield rubber are 1.07 and 1.21. Internal rate of return of the highest yield rubber and the average yield rubber are 14.50% and 10.91%. The covering-cost price of the highest yield rubber and the average yield rubber are 14.05 baht and 15.83 baht. The analysis of the appropriate age for rubber replacement by considering price of rubber’s timber indicates the age for rubber replacement of the average yield rubber is 20 years and the age for rubber replacement of the highest yield rubber is 19 years. When price of rubber’s timber is assumed to increase 300%, both of the age for rubber replacement are 15 years.
