The battle over consumer spending on food and household items continues to heat up and big-box retailers may be taking more market share from dollar stores across several categories.

What Happened: Discount retailerDollar General Corp(NYSE:DG) recently reported second-quarter financial results that saw revenue and earnings per share both miss estimates from analysts.

The company also lowered its full-year revenue and earnings per share outlook as the company may be losing market share to larger competitorsWalmart Inc(NYSE:WMT) andTarget Corp(NYSE:TGT).

Dollar General was asked about competition during its second-quarter...