Money used to lie in the streets here, on what once seemed a solidly built street known as Wall Street. But now it’s gone — that money. It turned liquid, even gaseous, and largely vanished into thin air. The 2008 financial crisis spread from here to the whole world. The mood is gloomy and bleak. The sun’s rays reach the ground of this hard-nosed financial world only once a day, briefly at noon, before moving on again after a quarter of an hour.