For the transaction banks, controlling costs per trade and costs per asset under management will become the key to profitability.

FORBES: Are Bankers Competent to be Running Banks?

At the same time, Exxon will cut its controlling stake to 22% by the close of the transaction, expected for June 1, 2012.

FORBES: Oil & Gas Paradigm Shift: Exxon Sells Japanese Downstream Assets For $3.9B