United States crude oil prices fell sharply, plummeting to their lowest levels since 1986, as a collapse in demand because of the coronavirus and the resulting economic shutdowns come atop shortages in storage capacity. West Texas Intermediate, the U.S. benchmark, dropped to nearly 10 dollars a barrel, a 45-per-cent decline, before ticking up a couple of percentage points. However, longer-term contracts were faring somewhat better, while still down on the day, signalling optimism that economic...