Note that I was originally trained as a physicist, and in physics, the Principle of Superposition assures you that any conclusion with internal validity will have external validity as well (i.e., the real-world motion of objects is just assumed to be caused by a straightforward combination of things that you can observe in labs). This is less so in other sciences, and much less so in social sciences like psychology and econ.
Because the causation is different between physical and social social science, with life science intervening. That is to say both the element of the system and the system itself become increasing complex and emergent, owing to difference in information.
Four levels of science
Noah Smith | Assistant Professor of Finance, Stonybrook University
What isn't (particularly) complicated is the basic dynamic of monetary systems…and so far we haven't figured out how to drive a robust economy without one.
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