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For point of comparison, from the article:

Turnover in the retail sector has been steadily rising and now stands 5 percent a month.

I think the costco article is saying 5%/yr, and the original article is saying saying that walmart's 60% turnover is consistent with retail average of 5%/mo

Here's an interesting article on the right way to measure turnover: http://www.ere.net/2003/10/06/the-right-way-to-measure-turno...

Tl;dr: provide context.

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