6576
Similar results had already been derived by John Hicks ( 1939 ) and Paul Samuelson ( 1947 ) .
 John Hicks, 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:
 John Hicks, Paul Samuelson