Dollar Tree said wealthier shoppers are increasingly driving sales as consumers hunt bargains.By completing this form, you agree to receive marketing communications from PYMNTS and to the sharing of your information with our sponsor, if applicable, in accordance with our Privacy Policy and Terms and Conditions .Complete the form to unlock this article and enjoy unlimited free access to all PYMNTS content — no additional logins required.The discount retailer released second-quarter earnings Wednesday (Sept. ...