Mistake #6: Neglecting to compute price per unit.
Some grocery baskets have a built-in calculator on it because smart shoppers compute their grocery items price per unit. You will always get the best value if you key it in your calculator. Why do this? Well, there are price differences when you buy a grocery item in volume. Others are priced in quarts while others in liters – which item can give you the best value? The calculator will help you with that.