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Robert Mundell 's " impossible trinity " is the most famous formulation of these limited powers , and postulates that it is impossible to target monetary policy ( broadly , interest rates ) , the exchange rate ( through a fixed rate ) and maintain free capital movement .
 person: Robert Mundell
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: Robert Mundell 
Answer:
 person: Robert Mundell