Informal Rules and Food Trucks

Planet Money has a great podcast about the food truck business in New York City. It discusses regualtions that make every parkinjg place illegal, how vendors identify good spots, the economics of location and how it is influenced by product differentiation. But my favorite part was the discussion of informal rules that govern the use of parking spots: If someone has been in a spot for 10 years that is his spot; if there is already a taco truck on the block, don't park your taco truck there.