Choices Among Technologies: A Historical Perspective -- Prices of Inputs -- Energy -- Fertilizers -- Water -- Conclusions on Prices of Inputs -- References -- Chapter 4: Trends in Productivity and Crop Yields in the United States -- Introduction -- Trends in Yields: All Crops -- Yields of Grain and Soybeans -- Conclusions About Trends in Technology -- References -- Chapter 5: The Demand for and Supply of Cropland -- Introduction -- Regional Projections of Production -- National and Regional Projections of Yields -- Demand for and Supply of Cropland -- Demand for Cropland for Crop Production.