This document discusses marketing channel flows including product, promotion, information, ownership, and negotiation flows. It also discusses factors that determine the role of intermediaries such as specialization and division of labor as well as contractual efficiency. An example is given of Granada Guitar Co.'s negotiation efforts and costs to distribute a new guitar line through 500 music stores. Finally, it introduces the concepts of channel structure versus ancillary structure and asks questions about why single channels are currently rare and why managing ancillary structure is likely less complex than managing channel structure.