I'm not sure why the folks on Google want to spread the belief that everything is a "black box" and that "we shouldn't pay any attention to the man behind the curtian" for every question. Case and point over on WMW a member inquires about the conversion rate when using adwords. After doing some checking here is the Google response
It looks like #3 is still going to be the correct answer. For competitive reasons, our AdWords product team does not want to release the source of our currency conversion calculations.
Huh? Aren't currency conversion rates published daily and financial institutions charge a percentage or flat fee to the customer, or am I missing something?