Which concept defines the desire and ability to sell a product at a specific price within a time period?

The concept that defines the desire and ability to sell a product at a specific price within a time period is supply. Supply refers to the total amount of a specific good or service that is available to consumers at a given price. It reflects how much of the product producers are willing and able to sell in the market, taking into account factors such as production costs, the price of the product, and market demand.

In the context of the question, "desire and ability to sell" emphasizes not just a want to sell, but also the logistical and economic realities that influence that ability, such as resource availability and market conditions. This aligns directly with the definition of supply, which is fundamentally about the readiness and capacity of sellers to offer goods or services at specific price points within defined time frames.

Understanding supply is crucial in analyzing how various factors influence market dynamics, such as changes in production costs, technological advancements, and how these elements effectuate the overall market supply curve.