189621
In the book , Krugman studies the past 80 years of American history in the context of economic inequality .
 person: Krugman
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: Krugman 
Answer:
 person: Krugman