I understand the concept of breaking the rules in order to create momentum for changing them - and I agree with _some_ of the changes Trump demands. But if tru

I understand the concept of breaking the rules in order to create momentum for changing them - and I agree with _some_ of the changes Trump demands. But if trust in the effectiveness and enforceability of rules is eroded by nationalist bluster and unreasonable demands (e.g balanced current accounts) then there will be nothing left to go back to. It will just be power politics forever, and that will degrade the world's economic strength and increase the risk of war.