Modeling Geographic Ferrous Scrap Markets: Regional Prices and Interregional Transactions in the United States*
构建了一个高度细化的美国区域废铁模型，用逻辑选择模型分析两种废铁等级的价格空间差异，并求解支持供需空间分布的均衡价格，适合研究废铁市场区域定价和跨区域流动的学者参考。
Abstract. The U.S. Regional Ferrous Scrap Model analyzes spatial variations in prices for two grades of ferrous scrap using a logistic model of choice under differentiated products. The model uses a computer-generated equilibrium framework to solve for prices that support the observed spatial distribution of supply and demand quantities. This paper presents the model's formal structure and its solution algorithm. The model specification is highly disaggregated with 1,212 supply and 240 demand regions. Characteristics of the equilibrium solution are described for prices and interregional flows. Sensitivity of equilibrium values to changes in model parameters is reported.