An illustration of the clustering of similar retail activities:
Hank Scorpio: Uh, hi, Homer. What can I do for you?
Homer: Sir, I need to know where I can get some business hammocks.
Hank Scorpio: Hammocks? My goodness, what an idea. Why didn’t I think of that? Hammocks! Homer, there’s four places. There’s the Hammock Hut, that’s on third.
Homer: Uh-huh.
Hank Scorpio: There’s Hammocks-R-Us, that’s on third too. You got Put-Your-Butt-There.
Homer: Mm-Hmm.
Hank Scorpio: That’s on third. Swing Low, Sweet Chariot… Matter of fact, they’re all in the same complex; it’s the hammock complex on third.
Homer: Oh, the hammock district!
Hank Scorpio: That’s right.
“The Simpsons” You Only Move Twice (1996) – Memorable quotes (speaking of James Bond films, Hank Scorpio looks a lot like Jimbo Wales)
David Levinson, Transportist 
This is something that struck me about Turkey — whether mobile phone operators, jewelers, or luggage vendors, multiple stores selling more or less perfect substitute goods clustered together. A Turkish friend who moved to the U.S. and asked where to buy a phone was quite surprised to be told, “Well, the nearest T-Mobile is here, and Cingular’s four blocks away on the other side of the freeway, and then there’s AT&T a short bus ride away…”
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