In order for a seller to part with their product, what must the buyer do?

For a seller to part with their product, it is essential that the buyer makes the seller better off. This means that the buyer needs to provide something of value that motivates the seller to give up their product. Typically, this takes the form of a monetary exchange, where the seller receives payment that they perceive to be worth more than the product they are selling.

The concept of value in economics hinges on the idea of exchange where both parties believe they are benefiting—sellers part with products in exchange for compensation that satisfies their preferences or needs. If the transaction does not make the seller better off, they have little incentive to engage in the sale. Therefore, the core principle here is that a successful exchange is predicated on creating a favorable outcome for the seller, which ensures the flow of goods and services in a market economy.

Other options like government-set prices, offering more products in exchange, or simply negotiating terms do not inherently guarantee that the seller's situation improves, which is what is fundamentally required for them to willingly part with their product.