If Broker A has no written agreement with Seller B and the arrangement is based on friendship, the listing agreement is considered:

In real estate practice, a listing agreement is a formal contract between a seller and a broker that outlines the terms of the broker's representation and the seller's obligations. When there is no written agreement in place, the terms of the arrangement become crucial in determining the nature of the relationship.

When an arrangement is based on a personal relationship like friendship without a written agreement, it does not conform to the standard requirements of a formal listing agreement. Such an agreement is classified as unilateral because it lacks the mutual consent expected in a binding contract, which requires both parties to agree on terms. Additionally, the absence of a written document renders it void under agency law, as most jurisdictions, including California, often require listings to be in writing to be enforceable.

In this context, since Broker A has no written agreement with Seller B, the nature of their arrangement is expressed as an intention to cooperate, but it is not enforceable because it lacks the necessary formalities. Thus, the conclusion is that it’s expressed, unilateral, and void, meaning it holds no legal standing as a binding agreement under the law.