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Well, seeing as how you can't add registers on the fly it would make sense to plan for max capacity...and you need a few backups in case of failure.
Home Depot seems to manage their lines pretty well.
Wal-Mart is another story entirely, but that's just their business model. Catering to low to low-middle incomes they really dont care how long you spend in line because the value is in the cheap product, not your personal time.
-spence
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