Answer:
200
Explanation:
When passing on an open highway, drivers should not pass a vehicle if oncoming traffic in the opposing lane is within 200 feet of them.
Monopsony is the term you are looking for. I know of one such place: Trail British Columbia. If the smelter ever shut down, Trail would become a ghost town (or very nearly a ghost town) very quickly. Most small mining communities are Monopsonies. If the mine closes, then the people living there have to be resourceful enough to create another industry.
John the baptist began preaching on his his early thirty's.