The stock has struggled for years, but signs of hope have emerged. The last nine years have not been good for Dollar Tree (DLTR 2.63%). The ultra-discounter made an apparent misstep in its acquisition of Family Dollar. Nine years after closing this purchase, it has failed to turn around the retailer, and it has never fully incorporated into Dollar Tree. Moreover, the stock has suffered in recent years as inflation has hammered the lower-income consumers it typically serves. The question for investors is whe ...