Banks, at least, are making money from a turbulent world

Or at least that is how it was a couple of decades ago, in the good old days. Following the global financial crisis of 2007-09, life sapped from the trading floor. Stringent new rules curbed profits. High-frequency traders ate banks’ lunches, especially in stockmarkets. For its part, the global economy was in a stupor, having been tranquillised by low interest rates. Markets moved linearly, with equities drifting up and bond yields slipping down. There were fireworks—the Brexit vote or the election of Donald Trump—but they were rare. This placid world provided investors with little reason to trade in and out of positions. Revenues were slim; returns sagged. Drama on trading floors featured lay-offs, rather than market moves.