The trouble with economics, though, is the assumption of the
Rational Man at the center of it. When economics is utilized as
a useful tool (talk about equivalent: UTILIZED... USEFUL ....
TOOL .... that sentence fragment beats the point to death)....
...it can be helpful in decision-making. But answers requires
not only a multitude of disciplines coming together, it
ultimately requires going BEYOND any individual or combination
of disciplines to get a "big picture"; which is, ultimately, a
story that ties them together.
Even THEN there's the application... and it's in the application
that the rubber meets the road. Still, getting things perfected
in models is very useful.