Julio Huato said:  
>My impression is that people on the heterodox side may be   
>clinging a bit too much to the old Cambridge Capital   
>Controversy, perhaps hoping for a Sraffian/Post-Keynesian   
>revival.  
  
  
Julio, I would say the problem is not  
the old Cambridge capital issues, although  
I take those seriously, nor even Keynesian  
issues, nor Hildenbrand-Grandmont aggregation  
issues, nor even Sonnenschein-Mantel-Debreu  
problems, although all of these are relevant.  
I would say modern complexity theory is the  
current wave of analysis here.  
  
Much modern macro is GE, but a lot of it is   
also representative agent, even as many  
increasingly realize how ridiculous that is.  
  
Barkley Rosser