10. Accessories and store brands
Some of the best profit margins come from accessories, especially in-house brands, says Thompson, who was a buyer for Circuit City. A USB cable made by the company's brand will often be placed right near the checkout counter. So a shopper who had the more expensive name brand in their cart may opt to switch to the cheaper version right before checking out.
Even being aware of these tricks of the trade, doesn't mean you won't fall prey to them. Thompson says that even though she's employed these tricks in her own line of work, "I fall for them every time I go into a store."
(AP Photo/Phil Coale)