Britain needs pure FREE TRADE in order to fix the mess.
Adopt basic principles of economics, supply-and-demand etc., as the foundation for the future economy, rather than the special-interest protectionism and nativism and pseudo-patriotism and demagoguery of the past.
Britain has an opportunity now to set a new course and serve as a role model for other nations.
It's always strange to see someone claim they want something and then go about doing everything possible to make it impossible.
I can imagine a bunch of Germans sitting around a table, sometime in the late 1940's and the question on everyone's mind was, "How the fuck did this happen?" German science and engineering was as good as any, but wasn't enough to prevent a soul crushing defeat. The plain truth was, the best tank, fighter plane, etc, ever made is going to lose when it faces 10 of the second best tanks, fighter planes, etc.
That led to the next question, "How could the United States make so many tanks, planes, and etcs?"
Being German, they analyzed the process. Iron ore could be mined in Minnesota and shipped to Michigan and made into tanks. It could also be shipped to California and Virginia to make ships. Oil pumped in Texas and Louisiana was sent along, so the engines could go varroom!
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Every state had a separate government, which could handle just about anything a government needed to do, except for one thing. None of them could put restrictions on interstate commerce. A dollar bill spent in New Hampshire was just as good as one spent in Florida. If a guy in Oregon thought he could do better in California, he was free to go there, or any other state. No restrictions on trade and commerce based on borders meant the resources and people of any state could go where they could be put to best use. The result was an industrial might that all the German engineering and science simply couldn't match.
Back to the Germans sitting around the table. One guy asks "What if we had something like that? I mean, suppose Europeans stopped trying to kill each once every 30 or 40 years and we just worked and made stuff to sell to each other?"
The other Germans looked at him in amazement. It was a crazy idea, but it just might work.