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Background
Limited studies have explored the association between clinical symptoms and titers of SARS‐CoV‐2 antibodies.
Study Design and Methods
In this cross‐sectional study, whole‐blood donors who had experienced a confirmed or suspected COVID‐19 infection completed questionnaires at the time of blood donation. Plasma SARS‐CoV‐2 immunoglobulin G (IgG) titers were measured using an enzyme‐linked...
Our study examines whether and how increased engagement in social responsibility activities by a firm affects movements in its stock prices during the COVID‐19 public health crisis, which is regarded as an exogenous shock to economic ties between focal firms and their customers, employees, and suppliers. We find that corporate social responsibility has an inverted U‐shaped relationship with shareholder...