|4 federal agencies to shut Friday|
|Chrysler jabs Tesla over loan repayment|
|Wall Street tries to buck global sell-off|
|Japan plunge spooks global markets|
|Tesla repays federal loan nearly 10 years early|
Wal-Mart holds Exxon Mobil at bay and rules the Fortune 500 for the second year in a row. Which other companies made the top 50?