Final answer:
People in East and West Egg have limited and mostly speculative information about Jay Gatsby; they are aware of his wealth and parties but not his past. Gatsby's elusive nature is intentional, making his story both unique and symbolically universal.
Step-by-step explanation:
The information that the people of East and West Egg have about Jay Gatsby is limited and mostly based on speculation and gossip. They are aware of Gatsby's lavish parties and his wealth, but the true nature of his past and the source of his fortune remain a mystery to them. F. Scott Fitzgerald purposefully leaves Gatsby's background ambiguous, presenting him through the eyes of Nick Carraway, a flawed narrator. This portrayal adds to the enigmatic allure of Gatsby and reflects the universal theme of the unknowability of others. Gatsby's story is individual and does not represent any other person of the 1920s, despite his apparent greatness. His narrative, while unique, symbolizes broader themes in American society such as disillusionment with wealth and the elusive nature of the American Dream.