Supermarket managers have all kinds of tricks to encourage people to spend money. Their aim is to slow people down as they move through the supermarket. To do this, they place colorful displays in surprising places to catch the customers' attention. They also make the aisles (walkways) near the cash registers narrower, so customers will not be able to move quickly with their shopping carts. Sometimes the floor is even slightly uphill for people moving toward the cash registers. The idea behind these tricks is simple: If you make customers go slowly, they will ●●●●.