US investors are once again paying attention to the dark clouds gathering over the global economy, with reason to fear that the next big storm could be as damaging as the downturn that accompanied the global financial crisis a decade ago.

On a day when the S&P 500 and Dow Jones Industrial Average were under pressure — though still up sharply from their late December lows — Peter Hooper, an economist at Deustche Bank, issued a report estimating the damage that may result if the three gravest threats to the global economy come to fruition.