A dabbawala is a person that collects freshly cooked meals from the homes of customers and deliver them to their workplaces, usually using bicycles and trains.

The lunchbox delivery system of Mumbai has been in operation for more than a century and is known for its efficiency and accuracy. The dabbawalas are organized into a complex system of sorting, transporting, and delivering the lunchboxes, with each dabbawala responsible for a specific area or delivery route.

The dabbawalas have been the subject of many studies, including a Harvard Business School case study for its reliability in deliveries. 

Looking at such a complex and well running system, it makes some wonder that letting people self organize can also lead to good results.