Prix et Profits is a 20-minute short film originally made for educational purposes and released in 9.5mm format. As the title suggests, the film follows the supply chain of a potato, from farmers to consumers, and examines the mechanisms of capitalism.

Maigret investigates in Concarneau where the passage of a yellow dog accompanies a series of murders, sowing terror in the population. The police seem helpless. It must be said that it has no significant evidence.