Wal-Mart Stores has only one supercenter in the state of California, but it's already shaking up conventional operators there.

Even before that first supercenter opened, the Bentonville, Ark., behemoth was causing seismic shifts in Southern California. The pressures of its expansion into Northern California in October may cause new fissures there resulting in an earthshaking upheaval in grocery retailing in the Golden State over the next few years.

Or maybe not.<

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