All of these activities have very high economic returns but, those that have public good characteristics have low financial returns. They are therefore difficult to finance. User charges will have to be used where feasible, but other financing means will need to explored.
The focus of attention in conventional economics, was on production of goods – manufactured products and agricultural commodities. It was, of course, recognised that the services sector (which includes transport, communication, trade, banking, construction and public administration, etc.) was an important source of income and employment in most economies.