You'd think what's the most expensive item by weight in the supermarket? Caviar or saffron, of course! But no. The real winner will surprise you. Imagine the price tag on a product you might otherwise skip. For example, a gram of the best Iranian saffron can cost up to $30, while a wild white truffle from Alba, Italy, can cost up to $5,000 per kilogram. These delicacies are shockingly expensive. But the absolute champion is edible gold. Ultra-thin sheets of 24-karat gold, used for decoration, are sold in some high-end supermarkets. A small package weighing 0.1 grams can cost between $15 and $20. This translates to over $150,000 per kilogram – a price that makes even the most expensive saffron pale in comparison. So, next time you pass by the shelves, remember: the most expensive item in your supermarket is not an exotic delicacy, but a literally shiny addition!