ToplineShares of Dollar Tree dropped 14% Wednesday after the company announced tough fourth-quarter earnings and said it would shutter 1,000 of its stores, marking the discount retailer’s worst day in more than six months.On Tuesday, Dollar Tree announced it would close 1,000 stores—mostly from the struggling Family ... [+] Dollar subsidiary.Frederic J. Brown/AFP via Getty Key FactsShares of Dollar Tree fell 14.4% Wednesday following an early-morning announcement of a lackluster fourth quarter. Wednesday m ...