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If preferences are like the real numbers then perfect knowledge over  
that space falls out as a theorem. To see this easily, consider the  
case when there is only one good, e.g., coffee. Then more is  
preferred to less is all you need to assume. From this you prove  
transitivity, etc.   
 
I guess this cultimates with von Neumann ... in *Games* von N and  
M don't even bother to use different symbols for preference and  
greater than ...   
 
It begins? A quarter says Samuelson. 
 
David M. Levy 
George Mason University 
 
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