POWER 50

There are lots of changes in the new SN Power 50 list, which celebrates its fifth anniversary in 2007. Some of the high and mighty fell a few notches because of a variety of challenges, including Wal-Mart's Lee Scott (from No. 1 to No. 4), who is battling lackluster same-store sales growth and pressure from a wide variety of constituencies, and Whole Foods' John Mackey (from No. 5 to No. 10), who

There are lots of changes in the new SN Power 50 list, which celebrates its fifth anniversary in 2007.

Some of the high and mighty fell a few notches because of a variety of challenges, including Wal-Mart's Lee Scott (from No. 1 to No. 4), who is battling lackluster same-store sales growth and pressure from a wide variety of constituencies, and Whole Foods' John Mackey (from No. 5 to No. 10), who has run into roadblocks with the proposed Wild Oats merger and is under fire fo

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