The economic feasibility analysis of used agricultural chemical plastic containers shows the net benefit from recycling them is 569,799 won/ton. This is a number in consideration of social costs and benefits. However, where calculated in terms of private costs and benefits, the benefits are just 77,561 won/ton. Based on 2,552 tons (the number of used containers converted to weight), the average of recycled used plastic agricultural chemical containers, the net social benefits by the used plastic agricultural chemical containers are about 1.45 billion won per annum. Assuming that the recycling volume and technology level similar to the current state continues for coming 30 years and applying 5.5% of discount rate per annum, the value of total social benefits (NPV) is 21.1 billion won. The analysis of economic efficiency of recycling plastic film wastes (LDPE: Low-density polyethylene ) shows that the net benefits are 576,747 won/ton in consideration of social costs and benefits. Calculation with private costs and benefits results in 84,543 won/ton for benefits. Because the recent average volume of recycled HDPE(High-density polyethylene) is 88,466 tons, the resulting net social benefits by recycling LDPE are about 51 billion won per annum. The current value for social benefits for the coming 30 years is about 740 billion won.