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Congress controls USPS rate setting, as well as mandates the rate of healthcare and pension benefit contributions.

I didn't know that. That seems to be the root of the issue then. Let the USPS set their own rates.

That's not the issue. The issue is the Postal Service was required to prefund its pension plan 75 years in the future, a requirement no other government corporation has: https://ips-dc.org/how-congress-manufactured-a-postal-crisis...