As for the crudities of hot-metal typesetting and letter-press printing, all these have long been superseded by electronic setting (in which a 1970s managing director, Ian Trafford, was a pioneer, and made The Economist one too), and by the stunning quality of modern offset printing.
These hot new dollars, fresh off the printingpress, are buying treasuries and mortgage-backed securities so that their market price is bid up even higher (and therefore interest rates are even lower).