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Notable liberal individuals whose ideas contributed to classical liberalism include John Locke , Jean-Baptiste Say , Thomas Robert Malthus and David Ricardo .
 person: John Locke; person: Jean-Baptiste Say; person: Thomas Robert Malthus; person: David Ricardo
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: John Locke, Jean-Baptiste Say, Thomas Robert Malthus, David Ricardo 
Answer:
 person: John Locke; person: Jean-Baptiste Say; person: Thomas Robert Malthus; person: David Ricardo