Coca-Cola cost a nickel for 70 years because of a short-sighted deal that gave two lawyers the rights to bottle Coke and buy syrup at a fixed price forever.  When bottled Coke took off, the Coca-Cola company massively advertised 5 cent Cokes to sell as much syrup as possible. They wouldn’t get more money if the price rose anyway so they decided to push selling as much Coke as possible at that great price. Then vending machines built to take a nickel became another sticking point for raising the price. Raising it to a dime was too much, and the U.S. Treasury wouldn’t make a 7.5-cent coin.  Eventually, inflation and a re-signed bottling contract made way for higher prices.  But 70 years is a long time for 5 cents.