10 For $10
Ten for $10 sounds like a great deal. However, you'll get the same savings even if you only buy one item, according to The New York Times. A grocery store survey recently found that people bought way more items when they saw 10 for $10 deals vs. five for $5 and one for $1 sales. Even if you aren't buying 10 items, your mind will trick you into thinking that the item is such a great deal that you end up buying more of it.