A more thorough explanation:

An output contract is a type of agreement commonly used in agriculture or energy industries. In this contract, a buyer agrees to purchase the entire output of a specific product or service from the seller. This type of contract is also known as an entire-output contract.

For example, a farmer may enter into an output contract with a grocery store chain to sell all of their crop yield for a specific season. The contract would specify the quantity, quality, and price of the product to be sold.

The benefit of an output contract is that it provides the seller with a guaranteed market for their entire output. This means that the seller can plan their production and sales accordingly, without worrying about finding buyers for their product.

In exchange for this guarantee, the seller agrees to sell their entire output to the buyer, and may not sell to other buyers during the term of the contract. This is considered valid consideration for the contract.

Output contracts may also include a "best efforts" clause, which requires both parties to make their best efforts to fulfill the terms of the contract. In some jurisdictions, such as California, this obligation is implied even if it is not explicitly stated in the contract.

Overall, an output contract provides both the buyer and seller with a level of certainty and security in their business dealings.