I don’t know who told me this story. But it’s an interesting one.
A JB HiFi employee was monitoring sales of a certain popular blue-ray movie in the early 10’s and they kept marking a singular unit down by a dollar and leaving it at the front of the cue. They’d do it each time one was sold.
A waste of labels, sure. But each customers’ bias and purpose of purchase would be based on gaming the system where they think they’ve stuck it to the business they’re buying from but they business has actually sold more units in a shorter time frame rendering their profits as higher.