Economics is a highly sophisticated field of thought that is superb at explaining to policymakers precisely why the choices they made in the past were wrong. About the future, not so much.
It's complementary. It's fairly clear where the boundaries are. When I start telling you the contents of his head, I am making it up. But I try to make it up based on what is on the record. So even my wildest speculations [on Thomas Cromwell] will have a root somewhere.