I'm going to speak specifically about the cell phone trade they have here. Honestly unless you have tons of money to spend, this is the place to buy or sell a cell phone. There are many vendors in the center, and they are all competing for the best prices and what not, and they sell new and used phones. Personally I prefer to buy used, as they are almost as good as new, and they are half the price. It's probably the only place in town where you can buy a phone for 30 dirhams! I also enjoy selling my phones here, as you can sell any phone, even if it's broken as many of the vendors are able to fix them by themselves.