Except at the quantum level, where there is no cause and effect, only probability. Maybe they will start stealing ideas from there as well to make up even more wacky economic theories.
Discussion
They're already at it I suppose. It's the arrogance of those who assume that the empirical method is the only path to ascertain truth.
I think Hoppe addressed this in his essays: 'Is Research Based on Causal Scientific Principles Possible in the Social Sciences?' and 'In Defense of Extreme Rationalism' and 'Economic science and the Austrian Method'
An excerpt from one of his footnotes in the third essay:
'In fact, it is precisely the indisputable praxeological fact that separate measurement acts can only be performed sequentially which explains the very possibility of irreducibly probabilistic - rather than deterministic- predictions as they are characteristic of quantum physics; and yet, in order to perform any experiments in the field of quantum mechanics, and in particular to repeat two or more experiment and state this to be the case, the validity of the causality principle must evidently already be presupposed.'