There can be many factors/scenarios that allow new listings to pump the price of a token, such as:
1. Exchange market makers trying to create hype for the token so they pump it as much as possible.
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I agree with you because I see that the first token listed on the exchange is always touted as the best so I am sure that hype like this will be the best factor for the Pump token price.
What I often see is a token that will be listed on Binance, almost all social media from the token provides good news so that the hype is felt and many investors buy tokens. For example, the token price increase scheme is like this :
1. Dev creates the BBB token.
2. Dev gives Ann about listing on Binance.
3. All members on Telegram, Facebook, X or forums focus on token listing.
4. The token price slowly rises due to the effect of purchases by the community from various followers on social media tokens.