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In 1993 mail and parcel contracts were poorly paid jobs compared to LPOs. 20 years on and the reverse now applies. Australia Post needs the mail and the parcels to be delivered so they are compelled to pay a current fair and reasonable price, which includes all the fixed cost that a contractor is required to pay, otherwise Australia Post won't get the mail delivered!
Mail contract payments have increased by more than 100% over the last 20 years because they need to reflect all the increasing cost the contractors face.