McDonald's is famous for its Big Mac which uses the double-decker burger style, but it was a different burger joint that got the trend going years before.

Rising fast-food prices over the past year have prompted consumers to cook cheaper meals at home and avoid eating out, hurting the industry.

Burger King parent Restaurant Brands and KFC owner Yum Brands missed market estimates for quarterly results on Tuesday, hit by weak demand in the United States and abroad from budget-stretched customers.