Trick question since I believe I already know the answer. But I'd like to hear some other views.
I believe that Economic Theory is like Psychology, it pretends to be a science, when really it is a religion.
People base their opinions on their beliefs. There usually isn't enough facts to go on, anyway.
A basic definition of what I mean:
Integrated Economy would be what the EU is aiming for. Seamless easy access for business to span borders. Favours big business.
Isolated Economy would be North America up to the 80s. Tariffs on most things to encourage local sustainability. Favours small business.
Anyone, anyone?