You are pushing your cart down the aisle when a massive, brightly colored yellow sign completely stops you in your tracks. It boldly screams that you can buy 10 items for just $10, and your brain instantly assumes you have stumbled upon an incredible bargain. The reality is that supermarkets use these flashy promotional signs to bypass your logical thinking and trigger a sense of extreme urgency. If you blindly toss those items into your cart without verifying the underlying unit price, you are likely paying a premium. Retailers are masters at making standard prices look like rare, limited-time events. Here is exactly why you should never trust a grocery sale sign without doing the basic math first.
