A recent snapshot of how grocers' prices compare with Wal-Mart illustrates Supervalu's key challenges (from the first week of July 2012)

Prices compared

with Wal-Mart

Supervalu + 24.3%

Safeway +17.3%

Kroger +10.1%

Target +4.6%*

* Target prices 0.6 percent less than Wal-Mart with a 5 percent Target rewards card.

Source: Citi Research