The document discusses common psychological techniques used in sales such as appealing to greed by envy of others' purchases, creating a fear of loss by implying limited availability, and invoking the Jones theory to create a sense of urgency and social pressure by claiming others nearby already made a purchase. It also mentions the indifference technique of seeming uninterested to pique the customer's interest and notes transactional sales approaches are best for immediate, low-dollar sales where ongoing relationships aren't needed.