The amount of a good or service that producers are able and willing to sell is the definition of

supply

Explanation:

In Economics, a "supply" refers to the amount/quantity of goods that a seller/producer is willing to sell/produce. It goes hand-in-hand with the word "demand," which refers to the amount/quantity of goods that a buyer/purchaser is willing to buy/purchase.

For example, a seller wishes to sell junk food in his convenience store because he hopes to profit from it. The quantity of junk foods he wishes to sell is called the "supply."

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