19677
Deeper analyses of this topic were taken up in industrial organization economics by crossover economics / strategic-management scholars such as Harold Demsetz and Michael Porter .
 person: Harold Demsetz; person: Michael Porter
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: Harold Demsetz, Michael Porter 
Answer:
 person: Harold Demsetz; person: Michael Porter