Unit four of this curriculum plan for ninth grade social studies outlines a study of the automobile industry in the United States. Objectives state the desired generalizations, skills, and attitudes to be developed. A condensed outline of course content precedes expanded guidelines for teaching procedures and suggested resource materials. A bibliography includes books, articles, and other related references. Appended are a questionnaire on autos, an exercise on purchasing an auto, and an excerpt from the President's statement to Congress on truth in lending. Related documents are SO 005 451 through SO 005 455 and SO 005 457. (SHM)