According to Marshall's definition, consumer surplus refers to the net income of consumers through the exchange of goods. Specifically, it is the difference between the willing price and the actual transaction price of goods. That is to say, the size of consumer surplus depends on two factors: the buyer's willing price and the actual transaction price. We know that the actual transaction price is the market price, a single buyer or seller can not control the market price, it is determined by the market. If the transaction price is the market price, the  size of the consumer surplus depends on the willing price of the buyer. The higher the buyer's willing price, the greater the consumer surplus.
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Consumer surplus is affected by sellers' pricing behavior.