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The basic concept was not new ; Laffer himself notes antecedents in the writings of Ibn Khaldun and John Maynard Keynes .
 person: Laffer; person: Ibn Khaldun; person: John Maynard Keynes
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Laffer, Ibn Khaldun, John Maynard Keynes 
Answer:
 person: Laffer; person: Ibn Khaldun; person: John Maynard Keynes