If one mailer were large enough to provide that mass, or nearly provide it, that mailer, by threatening to leave the Postal Service, might be able to negotiate extremely low rates.
The mailer will not be able to negotiate any rates.
mnli hypothesis: The mailer will not be able to negotiate any rates. premise: If one mailer were large enough to provide that mass, or nearly provide it, that mailer, by threatening to leave the Postal Service, might be able to negotiate extremely low rates.