Have investors overreacted to a bad quarter?The U.S. economy isn't in a recession yet, but there is no shortage of consumers who are struggling right now. Multiple years of price increases and higher housing costs are wearing down low-income consumers who shop at dollar stores. While you might assume a stock like Dollar Tree (DLTR 1.82%) should be fairly resilient in times like these, even it's having trouble generating much growth.The dollar store chain's recent earnings numbers weren't impressive, and the ...