As someone interested in politics, I am struck by 'what countries   
do.'  Obviously (and, I think, as I've been re-reading especially   
Ricardo, helpfully), individual (& corporate) agents in countries   
act, by and large.  
  
But of course the laws of the country set boundaries, sometimes quite   
severe, within which agents can act.  
  
And, I wonder -- when a country goes to war, do we still   
conceptualize it as individuals acting, or is that a case when   
countries act?  
  
Peter G. Stillman