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Gary Becker 's household production functions and similar topics note that people often purchase goods and then combine them with time to produce something that has meaning or practicality to them ( which produce utility ) .
 person: Gary Becker
Please list all entity words in the text that fit the category.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} 
Answer:
 person: Gary Becker