16:55 Jan 2, 2008 

After doing some more research, I've found "financial spread" in the IATE and in a few other documents, and I think I'm going to use that (based partly on a def. from The Economist mag: Spread: ... the price an underwriter pays for an issue of BONDS from a company and the price the underwriter charges the public;

23:15 Dec 21, 2007 

fwiw I just found this: Net interest margin -- or the profit pocketed on the difference between the bank's borrowing costs and its lending rates -- narrowed to 3.13 percent from ...
findarticles.com/p/articles/mi_qn4155/is_20040409/ai_n12541910

I'm wondering now if a combination of Smarttrans's answer and Richard's might actually be the best solution. I also found this: Net Interest Margin (NIM) is a measure of the difference between interest income generated by banks or other financial institutions by their lending and interest paid on borrowings (for example, deposits). It is considered analogous to the gross margin of non-financial companies.
http://en.wikipedia.org/wiki/Net_interest_margin

17:47 Dec 21, 2007 

¡Te deseo lo mejor para el año entrante, Patricia!