Source: adapted from Stutz, R. and A. de Souza (1998) The World Economy: Resources, Location, Trade and Development, Third Edition, Toronto: Prentice Hall, p. 268.
- Figure A represents what the agricultural land use would be if the most basic assumptions were applied, namely the market located at New York (or BostWash), crops being ranked by comparative rent paying abilities and considering ubiquitous geographical characteristics. Although this representation has some level of concordance with reality, it inaccurately portrays agricultural land use in the United States.
- Figure B includes one supplementary assumption that considers climate variations, where the north is colder than the south. This constraint has a significant impact on agricultural land use as even if for a location a crop would have a higher rent paying ability, another crop would be grown because climatic conditions forbids it. The resulting agricultural land use has a much higher level of correspondence with reality.