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In " conjectural histories " , authors such as Adam Ferguson ( 1723 – 1816 ) , John Millar ( 1735 – 1801 ) and Adam Smith ( 1723 – 1790 ) argued that societies all pass through a series of four stages : hunting and gathering , pastoralism and nomadism , agriculture , and finally a stage of commerce .
 Adam Ferguson, John Millar, Adam Smith
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:
 Adam Ferguson, John Millar, Adam Smith