The materials in this resource unit for Grade Nine focus on farm problems as a case study for supply and demand analysis. The unit emphasizes a problem-solving approach. Students define the farm problems, set up and test hypotheses about causes of the problems, and investigate courses of action. An outline of the content of the unit precedes detailed guidelines for achieving specified learning objectives--attitudes, skills, and generalizations. A bibliography notes books and special references, pamphlets, periodicals, U.S. Government reports, and newspaper series on the subject of farm problems. The rationale for the development of this unit for supply and demand analysis is given in a background paper by Darrell R. Lewis. Four basic market models are characterized and major analytical and topical approaches to American farm problems are explored. The paper is concluded by an annotated bibliography of resource materials and graphs which illustrate market models and statistics on supply and demand. Related documents are SO 005 451 through SO 005 454; SO 005 456; and SO 005 457. (SHM)