The Tail That Wags Apple

IT IS fashionable to say that tech firms will conquer the financial services industry. Yet in the case of Apple, it seems that the opposite is happening and finance is taking over tech by stealth. Since the death of Steve Jobs, its co-founder, in 2011, the world's biggest firm by market value has sold hundreds of millions of phones with bionic chips and know-it-all digital assistants. But it has also grown a financial operation that is already, on some measures, roughly half the size of Goldman Sachs.