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At a higher level of generality , Paul Samuelson 's treatise " Foundations of Economic Analysis " ( 1947 ) used mathematical methods beyond graphs to represent the theory , particularly as to maximizing behavioural relations of agents reaching equilibrium .
 Paul Samuelson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Paul Samuelson