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According to Israel Kirzner ( 1973 ) and Don Lavoie ( 1985 ) , entrepreneurs reap profits by supplying unfulfilled needs in all markets .
 person: Israel Kirzner; person: Don Lavoie
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: Israel Kirzner, Don Lavoie 
Answer:
 person: Israel Kirzner; person: Don Lavoie