Which investment product would be least attractive to an individual seeking to avoid credit risk?

An individual seeking to avoid credit risk would find a Ginnie Mae bond, a Treasury bill, or a banker's acceptance more appealing compared to a municipal revenue bond issued by an affluent town.

Municipal revenue bonds are backed by the revenues generated from specific projects or sources rather than by the full faith and credit of the issuing municipality. While affluent towns may have a lower likelihood of default compared to others, the risk is still present. Factors such as project performance or economic conditions can lead to decreased revenues, which could jeopardize the ability to make timely interest payments or repay the principal.

In contrast, Ginnie Mae bonds are backed by the U.S. government, providing a strong guarantee against credit risk. Treasury bills are also considered virtually risk-free, as they are obligations of the U.S. government. Bankers' acceptances, used primarily for international trade, usually involve banks, which adds a layer of security as they are time drafts guaranteed by banks.

Therefore, for someone looking to minimize exposure to credit risk, a municipal revenue bond would be the least attractive option among the choices presented.