#6: Filet-O-Fish, 1963
Price: $0.29
Created to boost sales on Fridays in heavily Catholic neighborhoods, the Filet-O-Fish was a strategic success. Its breaded fish patty, tartar sauce, and steamed bun appealed to customers avoiding meat, and it quickly proved there was demand for seafood in fast food.

Although it remains on menus worldwide, the Filet-O-Fish feels less essential today. Priced around $4.50–$5.50, it’s now a niche choice rather than a cultural moment. Still, it stands as one of McDonald’s most enduring problem-solving innovations.
