No school of economics has ever predicted the behavior of even a single stock or one economic crisis before it took place. Economic theories don't make any testable hypotheses. Despite using linear algebra and calculus, the only kind of analysis they do is purely a posteriori analysis. I'm sure they can fit curves very well, but what use is there in making broad claims about imminent collapse of certain industries or the fall of a certain mode of production if they cannot actually say how it will actually take place?
Physicis can tell us everything about the flow of water in tubes, the passing of electrical charges in chains of atoms, and even about the behavior of subatomic particles. We can find records of tests that have been carried out to test both accepted and discarded hypotheses in physics. We do actually know why aether definitely does not exist.
On the other hand, economics cannot get even the most basic of its facts straight, hence why the overall panorama of economics looks more like what ancient Indian and Greek schools of philosophy did than like any branch of the natural science does nowadays. There is no unifying law of economics, no fundamental axiom. Economics, is to put it simply, a pseudoscience, of no greater validity than psychology and political "science".
