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Although it is normal to regard the quantity demanded and the quantity supplied as functions of the price of the goods , the standard graphical representation , usually attributed to Alfred Marshall , has price on the vertical axis and quantity on the horizontal axis , the opposite of the standard convention for the representation of a mathematical function .
 Alfred Marshall
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:
 Alfred Marshall