I am long CBA at present so I am keen on the banks. However if NAB announce a takeover of Abby then they will get absolutley flogged by the insto's. They have only just done a complete about face with their "Positioning for Growth" statement and said they would not pursue this type of aquisition. The insto's don't like being lied to.
Also the NAB's recent track record for overseas takeovers is not all that flash.
