Consider a better tariff policy

We start with a proportional democracy and apply a rule. 

If the legislatures don't like something, tariff it, out of spite, no matter where it is. Then, we use automation to apply tariffs, internally or externally,  immediately. Transaction costs zero, pricing variance handled by efficient vote. We get a Coasian bargain, we Wiernesize parliament. This is the most direct path, it makes all those stupid theorems work, a bit lumpy due tradebook error, but they work. 

In other words, make the accounting obey the laws of mathematics, and your economic theory is self computed by the aggregate.