Which service is considered a competitive shipping service for the Postal Service?

Parcel Select is considered a competitive shipping service for the Postal Service because it offers an economical option for packages to be shipped with delivery to the destination post office, allowing for flexibility and cost-effectiveness. This service is particularly appealing for businesses engaging in bulk shipping, as it provides a way to manage shipping costs while still maintaining an efficient delivery process.

In contrast, Media Mail is specifically designed for shipping educational materials and books, and while it is economical, it does not serve the broader competitive shipping needs that many businesses require. First-Class Mail is more about letters and lightweight parcels, and while it includes competitive features, it primarily caters to letter mail rather than bulk shipping. Library Mail, similarly, is specialized for educational and library materials, lacking the flexibility provided by Parcel Select in terms of market competition.