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You can't test hypothesis with no control group and no way to falsify theories. Comparing economics to physics is absurd.

There has been a silent revolution in the last few decades which has resulted in a new branch of mathematics called Chaos Theory.

It happens to be quite capable of making a science out of traditionally difficult to understand subjects such as economics, psychology and sociology.

The comparison would have been absurd last century, not so much today.

How about astrophysics? Climate science? We don't always get a whole lot of experiments to do, sometimes one.