Yes, you can't run randomised controlled trials; but that's not what makes a science is it? In every other respect it's methodologically identical to physics.
Sport if oner cannot use scientifric reductionism to isolate what is being tested from the environment, then one cannot USE scientfic method to test one's hypothesis
Economics is an ART, not a SCIENCE (as we use those terms today, at least. The word science used to mean something very different than it does today).
But scientific method demands that one can study phenonema in cases where "all else being equal".
THAT is no more possible in MACRO economics than it is to do in history.
It is, possible, one supposes, in microeconomic studies, but even that is, I believe, somewhat dubious in most cases.
All the econometrics in the world of MACROeconomics does not change the fact that no SCIENTIFIC TESTING is possible
There's extensive testing. The problem, as mentioned before, is that we're unable to easily conduct randomised controlled trials. So that's what econometrics is for; for finding sophisticated ways to determine a parameter "all else being equal". The process of discovery is slower than in say, physics, since we can't easily make some RCTs, but the methodology is otherwise the same.
YOur FAITH is the system of scientific reductionism in the study macro-economics is NOT SUPPORTED by the historical reality of how often economists FAIL to get it right or at least AGREE on their findings.
The very fact that debates about how the economy works between EXPERT ECONOMISTS ought to tip you off as to the difference between a social science and hard science.
Every marco-economic policy is a kind of SWAG (scientific wild assed guess).
I mean, do think about this please...
Economist cannot yet even agree about what CAUSED economic events in the past to happen.
If every economist does not conclude IN RETROSPECT why an event in past happened in EXACTLY the same way?
Then the belief that economist can somehow, using the same metric models PREDICT the effect of an economic policy is nothing more than FAITH BASED THINKING.
And what the above ought to be informing you of is THIS the fundamental difference between the ARTS and the SCIENCES.
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