“I’ve survived because God was with me,” Ms. Terry said. “Every Sunday, my mother and grandmother prayed for me out here.”

She has shown younger workers the ropes: how to jump in a Dumpster to hide from the police, and how to stay alive. First, never enter a car with more than one person in it, and never let someone drive you out of the area. Get your money up front — Ms. Terry charges $50 or $100 — and try to work with a buddy.

The oldest profession blinks. Malcolm Gladwell would take note.