This likely does not make sense economically if the damage to the wider economy from unstable shipping costs is more than differential shipping pricing would re

This likely does not make sense economically if the damage to the wider economy from unstable shipping costs is more than differential shipping pricing would recoup. You are also directly marginalizing and redlining large parts of the country when going from a single, integrated shipping system where domestic shipping is a negligible overhead that most businesses eat to a system where most get slightly cheaper service, while others face prices drastically higher. Is it worth it to subsidies the margins to ensure everyone has access and opportunity? The Rural Electrification Act, Affordable Connectivity Program, Universal Service Fund, federal funding of transit (road & rail construction) and education would not exist if we as a society decided to say "Let's do nothing for our fellow American that don't have access to X".