The document discusses various channel systems used in marketing, including vertical, horizontal, and multi-channel systems. It also discusses retailers and the retail trade, defining a retailer as the last link in the distribution channel. The document notes that retailers break bulk into suitable lots for consumers and are best positioned to understand customer expectations. It also outlines factors that influence customer choice of retailer, including price, location, product selection, services, and salesperson helpfulness. Global and Indian retail trends are also summarized.