110908
The term value chain was first popularized in a book published in 1985 by Michael Porter , who used it to illustrate how companies could achieve what he called “ competitive advantage ” by adding value within their organization .
 Michael Porter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Michael Porter