Take care on how you organize the shelves: products on the sight-level (120cm) and products on the hand-level (80 cm) above the floor are sold the best, because they are the most visible ones. Products above 160 cm and under 50 cm are sold the poorest.
Use Ad Displays for certain products, because they increase your selling numbers especially for cheap products. Moreover they encourage impulsive buying. A better effect can be obtained, when you also display a price discount on the Ad Displays.
Position products, you want to make visible, into the corners of your shelves.
Banners and Pictures help people to orient in a better way and to distinguish your shop from other similar ones.
Avoid crowing to many objective in one place – people will not feel comfortable when they are constricted.
Waiting above 90 seconds, is perceived as waiting per se.
Waiting times can be shortened if customers are distracted by pleasant music, special products, videoclips, newspapers or special displays.
Customers have to perceive the checkout order as fair according to the principle first came, first served.