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.
TV host Lee Gates is in a dire situation and asks his audience to buy a stock to inflate its price and save his life. This clip shows the supply and demand side of the stock market: creating demand for a stock will increase its price.