Could you tell if sellers or buyers set a new coin's first dollar price?

Research question: When someone first sold a new coin for dollars, was the price set by the seller or by buyers, and how can a reader tell which one it was?

The records show that the first recorded sale of bitcoin for dollars took place in October 2009, when Martti Malmi traded 5,050 BTC for US$5.02 ¹. The same record notes that the document does not say whether Malmi or his counterparty set that price ¹. A second source dates the sale to October 12, 2009, and names Malmi as the seller of 5,050 bitcoins for $5.02, but it does not describe how the price was agreed ². These facts therefore cannot show whether the seller or the buyers set the price, so a reader would need a fuller account of the trade to answer that part of the question ¹².

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