The areas of the private sector that achieve the highest levels of efficiency are usually very driven by competition. The leaders of the businesses know if they cease the search to do better with less and give up the drive to innovate and change, their competitors will take their customers.
Advocates of nationalisation say that should be more efficient and low cost because it removes the need for competing management teams, multiple head offices and advertising. Looking at past experience shows this is just not true. Large nationalised monopolies offset the economies of scale with the inefficiencies of monopoly provision.
When the U.K.electricity industry was privatised the nationalised management fought against creating competing generators, claiming it would be dearer and less productive. The government split up the industry and created competition. In the first decade moving to a competitive system labour productivity doubled and electricity prices came down. The industry that had believed in fuel inefficient coal power stations went for the dash for gas. The new power stations were 60-70% more fuel efficient, greener and cleaner.
Public sector trading bodies that charge the customers should be subject to competition.