It's probably some complicated wage structure that requires Phd
level maths knowledge. 
do u know that the sub prime crisis was created by these PHD
fellows, to create a complex web of financial weapons of mass
destructions that created this mess.
Temasek Holdings have many PHD people working there right, to
advise the CEO Ho Ching, why is it then that Temasek went to invest
in citigroup in 2007 when it was going to implode in 2008 with the
collapse of Lehman Brothers in september 2008.