In my analysis, the action axiom in the Austrian school of economics is based on the following trilemma: either an action is determined, or it's random, or it's a choice. If it's a choice, then whatever you chose was the best option you had for whatever reason you chose it. If it's determined, we either say there isn't a choice happening, or equivalently you chose the best (and only) option you had. If it's totally random and no coherent narrative can explain it, then that violates the axiom, but there are good arguments that true randomness doesn't exist. Actions can have aspects of all three, but as movement through time entails physical action, the axiom simply states "time moves forwards and things aren't random".