This three-part curriculum for entrepreneurship education is primarily for postsecondary level, including four-year colleges and adult education, but it can be adapted for special groups or vocational teacher education. The emphasis of the eight instructional units in Part III is operating a business. Unit D focuses on market management. It provides information on typical marketing problems of the small manufacturing business, service firm, wholesaling enterprise, and retailing business and offers suggestions for making the right marketing decisions. The marketing functions included are market research, product planning, pricing, selling on credit, purchasing, stockkeeping and inventory control, channels of distribution, and advertising and sales promotion. Material is organized into three levels of learning which progress from simple to complex concepts: Exposure, Exploration, and Preparation/Adaptation. Each level contains preassessment; teaching/learning objectives; substantive information (questions in margins guide the students' reading); activities, including a postassessment; and a self-evaluation. Definitions of important terms are found at the beginning of the unit; a bibliography and listing of sources for further information are appended. The four-page instructor's guide contains the teaching/learning objectives, teaching/learning delivery suggestions, and pre/postassessment suggested responses. (YLB)