The economist Robin Hahnel has argued that free markets are in fact systematically inefficient, because externalities are pervasive, and because real-world markets are rarely truly competitive or in equilibrium.
经济学家Robin Hahnel指出自由市场事实上系统性地效率低下，因为外部性是普遍的，而且因为真实世界的市场很少真正竞争或者处在平衡中。