When Hewey, Dewey, and Louie Duck witness Gyro Gearloose's new invention, the Multiphonic Duplicator, they use it to duplicate their money. When Scrooge McDuck learns of the invention, he cautions his nephews not to spend the duplicated money or else they'll decrease the value of the currency. Inflation is further illustrated when the price of goods and services, such as lollipops and bus rides, increases astonomically.