"When Kenny Jones is hungry, he knows exactly what he wants.

"Super cheap and efficient," says the 24-year-old college student from Lawrenceville, Georgia.

So he heads to Taco Bell where, for a mere $5, he can load up on one of the chain's meal deals. On a budget, his $5 haul usually serves as dinner, but occasionally, he'll save some of the food for the following day.

"Value is important; it keeps me coming back," Jones said.

In the fast-food world, five – as in $5 – is the magic number. It has become the de facto sweet spot for trying to lure in customers based on meal price.

Chicken chain KFC has its $5 Fill Ups. Subway brought back its famous $5 Footlong sandwiches this winter. Little Caesars boasts a $5 Lunch Combo and Taco Bell has its $5 Buck Boxes. Plus, there are Dairy Queen's $5 Buck Lunch and Carl's Jr./Hardee's $5 All Star Meals that debuted in September."

Read the full article by Zlati Meyer here.