Here are 2 artificial ecosystems sharing a light source. Access to this light source is granted through a market. Each colony of photosynthetic bacterias can claim access to light thanks to credits earned for their oxygen production. The rules driving the market are optimized through a genetic algorithm. This artificial intelligence is testing different populations of financial systems on these 2 sets of Cyanobacteria. Like so, the photosynthetic cells and the computer are experimenting with different political systems granting access to this resource. The system oscillates between collaborative and competitive states. The genetic algorithm pictures the rules of these proto-societies as genes. By breeding populations of societies, new generations of markets arise. Like so, the sum of microscopic series of events determines the status of the system at a macroscopic scale.