A New Zealand newspaper reported that an integrated nature of capital markets, the mobility of capital and the global nature of the financial crises

A New Zealand newspaper reported that an integrated nature of capital markets, the mobility of capital and the global nature of the financial crises highlighted the need for a single set of high quality globally accepted accounting standards. the report went on to  state that banks particularly wanted to eliminate differing accounting treatments between jurisdiction. American banks were reported to have spent US$27.6 million on lobbying for such changes. 

(a) why, in particular, would banks be advocating for a single set of global accounting standards?

(b) Why might american banks be so willing to spend so much on lobbying ?

(c) If you were an American bank, who would you be  lobbying? and why ?