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Socialists including Karl Marx , Robert Owen , Pierre-Joseph Proudhon and John Stuart Mill advocated various forms of labour vouchers or labour-credits , which like money would be used to acquire articles of consumption , but unlike money , they are unable to become capital and would not be used to allocate resources within the production process .
 person: Karl Marx; person: Robert Owen; person: Pierre-Joseph Proudhon; person: John Stuart Mill
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Karl Marx, Robert Owen, Pierre-Joseph Proudhon, John Stuart Mill 
Answer:
 person: Karl Marx; person: Robert Owen; person: Pierre-Joseph Proudhon; person: John Stuart Mill