Every time Sohaila Rezazadeh rings up a sale at her Exxon station on Chain Bridge Road in Oakton, her cash register sends the information to Exxon Mobil's central computers. If she raises the price of gasoline a couple of pennies, chances are that Exxon will raise the wholesale price she pays by the same amount.
Through a password-protected Web portal, Exxon notifies Rezazadeh of wholesale price changes daily. That way the oil giant, which is earning about $3.3 billion a month,...
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