In QFL, the foundational principle is that the thing that can happen in the most ways happens first. This multiplicity principle serves as the root of probability itself.
This idea is mathematically isomorphic to Bayesian mechanics: the outcome with the highest number of possible paths naturally carries the highest probability.
In physical systems, this occurs because the number of ways a thing can happen corresponds directly to the number of bits of information. Each bit contributes the energy of one Planck action. Systems with more microstates are naturally selected because they align with zero-free action.
This principle directly grounds the path integral formulation. See: path_integral.md
It also connects to Karl Friston's Markov blankets and Bayesian mechanics. See: hadron_markov_blankets.md
It explains active inference and the emergence of order. See: active_inference.md
See also: AI.md; Measurement_Problem.md — ZFA closure as the physical realization of Bayesian update / measurement; Hierarchical_Control.md — multiplicity principle as bottom-up driver, Markov-blanket-screened prior as top-down constraint; derives Friston's free energy principle from ZFA; Born_Rule.md — the multiplicity principle plus the uniform prior over admissible histories derives the Born rule rather than postulating it; Active_Inference_Mathematics.md — folds the multiplicity-as-probability reading into the active-inference math framing where admissible trajectories are the mathematical objects.