PRODUCTION TECHNOLOGY AND INPUT ALLOCATIONS IN SRI LANKAN MULTICROP FARMING
研究了斯里兰卡旱区182个多作物农户的生产技术，通过系统估计生产函数和可变投入的一阶条件，计算了土地和家庭劳动力的影子价格，发现调整这些约束投入的分配可显著提高农户利润。
A primal production analysis is conducted of 182 farm households producing multiple outputs in the Sri Lankan dry zone. The approach involves systems estimation of the production functions with first‐order equations for variable inputs and permits recovery of the production technology for each crop. Land and family labour are regarded as constraining inputs. Shadow prices are computed for the constraining inputs and yield important implications for increasing household profits. Evidence of global homotheticity in a subset of three inputs is found for three of the crops. Weak separability is rejected in all tested subsets except for fertiliser and chemicals used in the production of vegetables. Input demand elasticities are computed for allocations satisfying necessary and sufficient conditions for profit maximisation. Highly elastic conditional input demands and output supplies are implied.