Me: “Your total is $24.30 (before tax).”

Customer: “I want to use my coupon.”

(The coupon is for $10 off a purchase of $25 or more.)

Me: “Your total is $24.30, so you need to spend $.70 more to use that coupon.”

Customer: “What do I do?”

Me: “You could just add something.”

Customer: “But I don’t need anything!”

(Despite my attempts to help her save money, the customer continued to refuse to add anything. So, what did she do? She paid the full price and left, oblivious to the fact she could have saved over $10 by spending just $0.70 more.)

Related:
Less Is More, More Or Less