Rationality is not assumed, and therefore not required. Only purposeful action.
Oh, please, same thing here.
Let's do us all one better and nail this down.
"Predictable, repeatable action"
Predictable only insofar as it has to follow some simple rules. For example, if you own a good G, that you could use to satisfy either a desire D1, or a competing desire D2, you will choose to use G to satisfy the greater one of these two desires at that point in time.
Repeatable is even untrue, unless I misunderstand your meaning. First of all, the ranking of your goals or desires is not assumed to be constant over time. Also, it is not assumed that your world model is constant. Quite the opposite, it is often explicitly emphasized that humans have the ability to change their mind about things, for example by learning.
Anyway, if it isn't -- no, there are no universal economic laws, for the very simple reason that "humans are not always rational" and economics is fundamentally about human behavior, in groups, no less.