"Happy Money" explores how people can spend money to maximize happiness. The authors, Elizabeth Dunn and Michael Norton, present five principles based on research: buy experiences over material goods, make it a treat, pay now, consume later, buy time, and invest in others. The book examines various spending scenarios, from everyday purchases to major life decisions, demonstrating how altering spending habits can significantly impact well-being. It also discusses how businesses and governments can encourage happier spending practices.