But why not even things out by ignoring cost differentials between, say, letters and flats; cost differential put on the table by the USPS a decade ago?
Costs haven't changed in the past 0 years.
mnli hypothesis: Costs haven't changed in the past 0 years. premise: But why not even things out by ignoring cost differentials between, say, letters and flats; cost differential put on the table by the USPS a decade ago?