Confusion in the Produce Section

This goes with my previous post, but I though if you were interested in it this might be interesting to you. I went to the store today to buy my Christmas groceries before it gets too crazy. I bought sweet potatoes/yams. There were two types of labeled yam, and one labeled sweet potato. Sure enough, the produce box for all of them was labeled sweet potato. Odd huh. They were three different boxes that said the type of yam/sweet potato as well as labeled in large print, sweet potato. Why do things have to be so confusing sometimes.