A model of homogenous input demand under price uncertainty
检验了价格不确定下企业权衡预期成本与风险来选择最优供应商组合的同质投入需求模型，并将其应用于日本蒸汽煤进口市场，分析五个供应商的竞争。
This paper examines the empirical validity of a model of homogeneous input demand under price uncertainty in which firms trade off expected input cost against its variability (risk) in selecting the optimal input supplier mix. Using recent work in time-series econometrics, this model is applied to the Japanese steam-coal import market, where five suppliers compete: China, the Soviet Union, South Africa, the United States, and Australia. Copyright 1991 by American Economic Association.