Write a paragraph in response to each of the following questions.  Outline the four definitions Platt uses of land (pp. 4-8). Explain Von Thunen’s concept of “economic rent” (p. 29). Briefly summarize William Gilpin’s and John Wesley Powell’s opposing views of the American West described by Stegner in Beyond the Hundredth Meridian.   Pick one of the works by Cather, Moran, Catlin, or Harris and describe how the work represents one of the four definitions of land used by Platt (pp. 4-8).