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The concept was first developed by John Maynard Keynes in his book The General Theory of Employment , Interest and Money ( 1936 ) to explain determination of the interest rate by the supply and demand for money .
 person: John Maynard Keynes
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 Maynard Keynes 
Answer:
 person: John Maynard Keynes