This article addresses a number of key problems commonly confronted in the literature on international demand analysis. These include data issues and requirements, multistage budgeting, outliers, group heteroskedasticity, and model selection. A two-stage demand system is fit to International...

The purpose of this study is to understand the implications of farm-to-farm and regional variations in nitrogen runoff and leaching for targeting specific policies to reduce nutrient contamination. To do this, we estimate 3D-year distributions of nitrate runoff and leaching for individual soils...