To the Editor: 7 column, "Format Proliferation" could also have been named "Format for Success." That's because survivors in the global-retailing-consolidation race will feature multi-format expertise. That makes sense since it allows retailers to leverage their investment in technology, and optimize their supply-chain efficiencies and buying clout. The world's three largest retailers ( Wal-Mart Stores, Carrefour and Metro) operate at least four distinct formats: hypermarket/supercenter, ...

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