My county has a pop of almost a million, my city, just a SUBURB of NYC, has 250,00. Apartment bldgs help the density. The New York metropolitan area, with an estimated 19,750,000 people in three states, is the largest metropolitan area in the nation.
Thus on a major street about 7 miles long, there can be 2 Wendy's, etc. LOL. And, 19,749,990 people are shoppers and 10 are schedulers.
No one could ever do MSing here full time, unless they stayed up at their computer 24-7. Except in undesirable areas, many jobs fly off the boards as soon as you get the email. As I was explaining a few months ago, you also can't go too far out of your area because of traffic, bridges, tunnels, lack of parking and other profit-stealing factors. I get offered bonused shops in the city, but I'm not going into midtown traffic, pay $20 to park my car and walk 6 blocks.
An interesting and useless stat I've compiled: In my county, there are 7 Staples, 8 Sleepy's Mattresses and only 1 Office Depot. Haven't counted the Dunkins and Subways yet. Unfortunately the Sleepy's shop, which takes about an hour, pays only $7. LOL.