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I don't know if it's what you're looking for, but I just used Stanley  
Fischer's "Seignoriage and the Case for a National Money" The Journal  
of Political Economy, Volume 90, Issue 2 (Apr. 1982), 295-313 in a  
macro class. Students replicated and updated Fischer's work by  
calculating seignoriage rates (as a percentage of nominal GDP) for a  
variety of countries using the IMF's International Financial Statistics.   
 
While Fischer discusses the conditions under which a country might  
use foreign money, I mention the empirical work (and it's pretty easy to  
do) in case you also wanted your students to crunch some numbers. If  
you are interested, I can send you an Excel workbook I developed for  
this task.   
 
Humberto Barreto 
 
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