These days, nothing goes without saying. : Tech, finance, media and other executives are calling on Americans to stay cool during a heated election season. “The health of our economy and markets depends on the strength of our democracy,” the LinkedIn co-founder Reid Hoffman said in a statement signed by more than 50 business leaders, provided first to DealBook. The group, convened by the Leadership Now Project, also includes Eddie Fishman, the chief operating officer of D.E. Shaw; Seth Klarman, the C.E.O. of Baupost Group; Lisa Lewin, the C.E.O.