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The stability of the demand for money prior to the 1980 s was a key finding of Milton Friedman and Anna Schwartz supported by the work of David Laidler , and many others .
 person: Milton Friedman; person: Anna Schwartz; person: David Laidler
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: Milton Friedman, Anna Schwartz, David Laidler 
Answer:
 person: Milton Friedman; person: Anna Schwartz; person: David Laidler