Ordinarily, a new medical treatment is approved only after at least one large-scale, randomised controlled trial shows it to be effective without being harmful. Yet at times — and notably during epidemics — evidence can mount that a treatment is safe and effective before we have that final evidence. We think this is the case with Covid-19 and convalescent plasma. ...

After a more than year-long review of its monetary policy strategy, the Federal Reserve has decided it will throw away the rule book and let inflation run higher and unemployment run lower before seeking to tighten financial conditions. To be clear, this change leaves the central bank pursuing an almost completely discretionary monetary policy, one where the risk is that ...

Bloomberg Boeing Co grounded eight of its 787 Dreamliner jets for inspection and repair after finding two manufacturing flaws that together could compromise the structural integrity of the aircraft. The distinct issues involve the composite barrel sections at the rear of the wide-body plane, which are melded together at a Boeing plant in South Carolina. Together, the flaws cause the ...