A well-known economist assured me this week that there would be a Catalan government budget for 2026. He was very convinced. In fact, he had no doubt whatsoever, after applying game theory, a branch of mathematics used to model situations involving negotiation, conflict, competition, cooperation, and other similar interactions. This theory aims to determine the best possible strategy for each player and the expected outcome of each situation. Games can be zero-sum (the gains or losses of some players are offset by the gains or losses of others) or non-zero-sum, meaning everyone can win or lose.