Many years ago, I worked as a greengrocer for a while — it was a job I really enjoyed. I thought of several things to help persuade people to buy more of our produce, but never thought of this — maybe I wasn’t as canny as I thought I was.
A greengrocer put up a sign that read “Aubergines, 25 pence each — or three for a pound.”
All day long, customers came in exclaiming: “Don’t be ridiculous! I should get FOUR for a pound!”
Meekly the greengrocer capitulated and put four aubergines in their bags.
The tailor next door had been watching these antics and finally asked the grocer, “Aren’t you going to fix the mistake on your sign?”
“What mistake?” the greengrocer asked. “Before I put up that sign no one ever bought more than one aubergine.”