The book "The Difference Between Expected And Experienced Utility: A Case Study On a Salary Increase" offers an in-depth analysis of the discrepancy between expected and experienced utility in the context of salary increases. It examines whether individuals capable of making rational decisions actually make the right choices regarding their utility. The author, Hatime Kamilçelebi, highlights the theories of Jeremy Bentham and Daniel Kahneman to demonstrate that experienced utility is measurable and differs from expected utility. Through a series of experiments, the argument of mainstream economics that experienced utility is not measurable is refuted. The study's results show that an increase in absolute income enhances individuals' happiness, while simultaneously revealing a gap between expected and experienced utility due to misjudgments or illusions. This academic book is aimed at readers interested in economic theories and their practical applications.