The French company Air Liquide uses agent-based simulations (modelling trucks as ants following pheromone trails) to find the most efficient delivery routes: "It's a supply chain that can create 3 trillion daily combinations among all its constituent parts; it took 22 full-time logistics analysts nearly half a day to generate a delivery schedule that would get every product to its destination on time". With the simulations, it now takes one analyst two hours.