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Even when existing terms are adopted - for example , the theory of surplus value , which combines David Ricardo 's concepts of rent , profit , and interest - their meaning and relation to other concepts in the theory is significantly different .
 person: David Ricardo
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: David Ricardo