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In particular , the rejection of perfect competition does not generally entail the rejection of free competition as characterizing most product markets ; indeed it has been argued that competition is stronger nowadays than in 19th century capitalism , owing to the increasing capacity of big conglomerate firms to enter any industry : therefore the classical idea of a tendency toward a uniform rate of return on investment in all industries owing to free entry is even more valid today ; and the reason why General Motors , Exxon or Nestlé do not enter the computers or pharmaceutical industries is not insurmountable barriers to entry but rather that the rate of return in the latter industries is already sufficiently in line with the average rate of return elsewhere as not to justify entry .
 General Motors, Exxon, Nestlé
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:
 General Motors, Exxon, Nestlé