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.
Scrooge McDuck tells the story of how and why he emigrated to America. His parents believed in the American Dream and felt he deserved better, so they encouraged him to earn the money to move overseas. After working smarter, not harder, he earned the money he needed to move in a few months.