Which of the following is NOT a product of the Postal Service that has no competition from other delivery companies?

The correct response identifies Express Mail as not being a product of the Postal Service without competition from other delivery companies. Express Mail services, which provide expedited shipping and next-day delivery, compete directly with courier and logistics companies such as FedEx and UPS. Both of these companies offer similar expedited services, which means that Express Mail doesn't hold a unique position in the market.

In contrast, First-Class Mail is a core product branded by the Postal Service, with a focus on delivering letters and small parcels; it is often seen as a standard service with competitive pricing. Bound Printed Matter is a service that provides cost-effective mailing options for printed materials that do not compete as intensely with private sector companies. Library Mail, aimed at the shipment of materials between libraries, also enjoys minimal competition in its specific niche.

Thus, the distinguishing factor for Express Mail is that while it provides essential services, it does not have the unique status that some other Postal Service products have in terms of competition.