Potbelly (NASDAQ:PBPB) is hitting low after low. Adding insult to injury, the sandwich company had a 2.2% drop in comparable store sales during the first quarter -- and it's warning of another 1.6% decline in the second quarter. To put it simply, the fast-casual dining chain is struggling with increased competition in this space.

In this segment of The Motley Fool's Where the Money Is, consumer-goods editor Mark Reeth and analyst Sean O'Reilly discuss what this tough business environment means for Potbelly and its 300 stores around the U.S.