Do the following functions exhibit increasing, constant, or decreasing returns to scale? What happens to the marginal product of each individual factor as that factor is increased and the other factor held constant?
A.随着可变要素投入增加,其边际产量递减
B.其它条件不变时,可变要素的边际产量先递增后递减
C.是长期规律
D.当所有要素投入的变化幅度一样时才成立
A.从一定土地上所得到的报酬,随着投入增加,报酬的增加却在逐渐减少
B.决定植物产量的是土壤中那个相对含量最少的养分因素
C.必须把植物吸收的各种矿质养分以施肥的手段补充给土壤
D.营养元素在作物体内的含量差别很大,其重要性也差异较大