Chick-fil-A is the fifth largest US fast-food chain in terms of market share, up from the No. 23 spot in 2005, according to a Goldman Sachs analysis.
It costs more than $1 million to open a McDonald's, Taco Bell, or Burger King restaurant. Opening a Chick-fil-A costs just $10,000.
Teens have a clear preference when it comes to national restaurant chains — and McDonald's leads the pack.