三、一种可变生产要素合理投入的确定 Factor-product- factor price change Total Cost More fertiliser is used Marginal Cost Total revenue ?00 Marginal Revenue Total Cost 2 Marginal cost 2 Kg of fertiliser三、一种可变生产要素合理投入的确定 Factor-product - factor price change -?0 ? ?0 ?0 ?0 ?0 ?00 ?20 0 20 40 60 80 100 120 140 160 180 200 220 240 Kg of fertiliser ?per ha Total Cost Marginal Cost Total Revenue Marginal Revenue Total Cost 2 Marginal Cost 2 More fertiliser is used