New research from London-based Planet Retail reveals sales at limited assortment "hard discounters," including dollar stores, have expanded more than 60 percent over the past five years, outperforming the grocery channel as a whole, thanks to growing consumer acceptance, expansion into new categories and the introduction of additional SKUs, including more premium offerings.

Until recently, discounters have been mostly a European phenomenon.But in the United States, discounters grabbed less tha...
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