When banks go bust: Four factors at play

Banks are in the news again. Two bank failures in the US, and the forced takeover of Credit Suisse by UBS in Switzerland, have triggered the worst turmoil in the banking sector since the 2008 financial crisis. There's talk of a lack of trust, of a collapse in confidence, of contagion and systemic risk. Jannie Rossouw, visiting professor at the Business School of the University of the Witwatersrand, explains why they're concepts worth understanding.