Some finance is needed and beneficial. The ability to form corporations and raise money through the stock market enhances many other fields of endeavour.

But this can go too far. In London during 2000-2008, finance consumed every spare IT worker, as well as mathematicians and physicists. Salaries were far higher working for a bank than working in any other IT-related industry or start-up. Did this produce great works? Is London now better off because of this? In a word, no.

What’s your basis for concluding “no”?

London is a very desirable place to live.

The problem I have with these arguments is that they're awfully close to the anti-tourism arguments you hear in tourist towns such as Tahoe. You have this influx of visitors and money, and there's a considerable number of residents who see it as uniformly negative: congestion, high property prices, and so on. Imagine what it could've been without all these rich tech bros!

But then, the US is full of picturesque small towns where the original heavy industry (logging, copper mine, steel mill) disappeared and tourism did not fill the gap. And all the young people moved out in search of better opportunities, except for the ones addicted to meth. There's no money, no jobs, no hope.

Every socioeconomic shift has downsides, but it doesn't automatically mean that the alternative is better. Broad economic gains tend to lift all boats because money changes hands.