Diagram to show how govs effect efficiency:
The diagram shows where public sector and private sector firms operate.
Private sector firms are more likely to operate at Q1 P1, which is the profit maximising level of output and price.
A public sector firm is more likely to operate at Q2 P2, which is the allocatively efficient level of output (AR=MC).
Therefore, government intervention might lead to an increase in economic efficiency, since the objectives change from profit maximisation to maximising social efficiency.