Subway

The Bottom Line: The marketing campaign was one of the most successful in restaurant industry history. But that promotion is stuck in consumers’ memory, making its offers more difficult.

The sandwich giant plans to give digital customers $6.99 Footlong subs starting later this month. The company has seen soft sales in recent months as consumers cut back on dining.

As Subway's dominance has eroded over the past decade, Jersey Mike's has rapidly gained market share in the sub-sandwich restaurant category, setting the stage for an eventual takeover.