Dollar-store chains did well during the downturn, as lower prices became the driver for more of shoppers' spending. The chains are betting that trend will continue as the economy improves, and are investing in expanding their store bases. Dollar General, the largest player, plans to add 600 locations this year. "Value means more today than it did two years ago, and no retail CEO thinks it is going to be like it was. We're in a new spending norm," said CEO Rick Dreiling.
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