  We suggest to look at quantum measurement outcomes not through the lens of
probability theory, but instead through decision theory. We introduce an
original game-theoretical framework, model and algorithmic procedure where
measurement scenarios are multiplayer games with a structure all observers
agree on. Measurement axes and, newly, measurement outcomes are modeled as
decisions with nature being an action-minimizing economic agent. We translate
physical notions of causality, correlation, counterfactuals, and contextuality
to particular aspects of game theory. We investigate the causal consistency of
dynamic games with imperfect information from the quantum perspective and
conclude that counterfactual dependencies should be distinguished from
causation and correlation as a separate phenomenon of its own. Most
significantly, we observe that game theory based on Nash equilibria stands in
contradiction with a violation of Bell inequalities. Hence, we propose that
quantum physics should be analyzed with non-Nashian game theory, the inner
workings of which we demonstrate using our proposed model.
