The commodity approach to marketing concentrates on a particular commodity such as maize and follows it through its various processing stages as each market function is performed by each institutional organization. It combines institutional and functional approaches in studying marketing of a single commodity. It helps focus attention on physical differences of commodities that contribute to different marketing costs. It is therefore more comprehensive when more details of single commodity marketing system are required since it tackles all issues relevant to the single commodity from supply point to the end user point.