The economy isn’t helped by rushing back to work in the face of a pandemic, according to a new study by Federal Reserve researchers. At a time when the lieutenant governor of Texas has said senior citizens would be willing to sacrifice their lives for a better economy and when President Trump has fretted that the cure may be worse than the disease, a new research paper looked at the impact of the 1918 Spanish flu on the U.S. economy. Far from hurting the economy, what are called nonpharmaceutical interventions — for example, shutting schools, establishing quarantines and restricting business...