The quality of money affects how much people want to keep in their wallets. A new way to measure this quality was developed for the eurozone. Money's quality depends on how well it works as a way to buy things, save value, and keep track of prices. The quality of money can change because of how the government manages money and the rules of the money system. The study found that the quality of euro money has been getting worse over the years from 1999 to 2019.