Thats why the city of london is older than England it's self. because it provided finance for various powerful people to do "powerful people" things
Venice for example was ruled by a mercantile banking dynasty.
It's really not "essentially sovereign" or "outside national law" as you might argue of an embassy or a military base or even, say, the Channel Islands. People and businesses there are subject to all the laws of the land. Financial firms there are regulated by the FCA, which is based outside the City and appointed by the Treasury, definitely not by the City of London Corporation.
Prestigious financial firms have offices in the City because everyone else does, not because there's some legal or regulatory benefit from being incorporated there - again, very different from those who choose other Crown jurisdictions like Jersey or IOM or the Caymans.
This is definitely not true. Maybe you confused it with Isle of Man or Channel Islands, which are crown dependencies with certain autonomy, often accused to be British tax havens.
yes I am a wonk
Not sure how seriously I'm arguing that, but it does seem that if the situation was sustainable/survivable there would be records of previous instances of that situation.
The brain does far, far more than marshal resources and distribute the where they are needed, which in essence is what the financial sector does for the economy.
Because of our brains, humans are extremely adaptable. Even with primitive technology we spread throughout the globe, and unlike wild cats or bears we haven't needed to speciate into each climate, develop camouflage fur, etc. The biological investment in an advanced brain gave us the opportunity to thrive everywhere.
It is strange that an industry whose only purpose is to service the productive economy should be 20% of GDP.
Here's an interesting take of the downsides to having such a large financial sector within an economy: https://www.theguardian.com/news/2018/oct/05/the-finance-cur...