Why FinTech Could Be a Casualty of Brexit
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Aaron Klein is a fellow and policy director at the Initiative on Business and Public Policy at the Brookings Institution.

London's role as Europe's financial services center has been called into question as a result of the UK's decision to leave the European Union - the "City's" future in the world of finance is very much in doubt.

Yes, London will remain a financial services hub, as it has been one for a long time. After all, the UK is still the world's 6th largest economy. But the size and scope of that hub could be very different depending on how things shake out with Brexit. Frankfurt is a logical landing spot for financial services firms given its secondary role behind London. Amsterdam has a long history in banking. And France's Prime Minister has made clear his country's strategic desire to lure financial services firms to expand their operations in Paris , even promising to keep taxes on expats living in France the most favorable in Europe to attract London's finance sector.

Meanwhile, major American firms like JPMorgan , , Merrill Lynch , and , as well as Britain’s Standard Chartered made a pledge to British finance minister George Osborne to try to support London’s financial sector in the wake of Brexit, although details on what this means are not clear.

In order to understand what may happen and where the future of financial services may go, it is important to understand how and why financial services hubs exist.

London was the global financial services hub for a long time; after all, London was the largest city in the world in 1900. As the capital of the British Empire, with a strong rule of law, history of financial services, and the world's reserve currency, London was the natural landing spot for the global financial system. Financial services, particularly for activities like payments and settlements between banks, requires economies of scale, and both legal and physical security. When London was viciously bombed during World War II, large portions of the global payments system were forced to move, choosing New York City as a logical landing place. As the United States emerged as the global economic power with the world's new reserve currency after the war, given the cost of movement, and the reality that its location in New York was working, large portions of the global payment and financial system remained. Recently, New York and London have battled each other for the title of global financial capital (with Singapore and Hong Kong rising over time). Brexit is likely a self-inflicted knock-out punch (or to use a soccer metaphor, an "own goal") that will solidify New York's claim to the title.