The document discusses how psychology is used in ecommerce to encourage buying. It explains that psychology has long been used in advertising and retail store layouts. Some key triggers for buying behavior include brand recognition, scarcity, and social proof. Online retailers address these triggers through trust signals like security badges, membership badges, testimonials, and guarantees. The document also outlines Robert Cialdini's six principles of influence - reciprocity, commitment, social proof, authority, liking, and scarcity - and how they can be applied in ecommerce.