A sign is posted in front of a Dollar Tree and Family Dollar store on March 13, 2024 in Rio Vista, California.Shares of Dollar Tree fell about 10% in premarket trading Wednesday after the discounter cut its full-year outlook, citing increasing pressures on middle-income and higher-income customers.The retailer said it now expects its full-year consolidated net sales outlook to range between $30.6 billion and$30.9 billion. It expects adjusted earnings per share to range from $5.20 to$5.60. That compares to ...