Transaction Utility
Transaction Utility is a cognitive bias where individuals derive psychological satisfaction not just from the value of a product (Acquisition Utility), but from the perceived quality of the deal itself. Developed by Nobel laureate Richard Thaler in 1985, this mental model explains why we buy items we don't need simply because they are "on sale," and why a $5 discount on a $15 item feels significantly better than a $5 discount on a $500 item. Understanding Transaction Utility allows decision-makers to separate the "Thrill of the Bargain" from the actual utility of the purchase, leading to more rational spending and more effective pricing strategies.