摘要:The present tendency to privatise and deregulate is largely explained by the widespread view that public ownership is inefficient, in particular under monopoly (Millward and Parker, 1983; Kay and Thompson, 1986; Vickers and Yarrow, 1988). The empirical research is fairly inconclusive, however, and the same can be said about the the theoretical literature. Together, these studies raise questions about policies that favour, unequivocally, either nationalisation or privatisation. A useful economic theory of ownership should therefore be consistent with the fact that there are both efficient and inefficient private and public enterprises. To know when a given form of ownership works and how it can be best improved might be more useful than assertions that one ownership form is always better.