The book's arguments are well marshalled, and can be summarised simply as stating that a cost effective way for an economy to grow is by reducing the amount of government regulation in various industries.
Hahn does not confine his arguments to the US. Indeed, half the book describes the impact on the developing world, where the need for growth is far more acute, due to burgeoning populations, subsections of which subsist at very minimal levels. Empirically, the massive growth of Chinese manufacturing and Indian information technology has been attributed in no small part to their governments reducing regulations.
For the US, Hash predicted that some industries like telecommunications and electricity would deregulate slowly, due to their complexity. He specifically cited these two! From the perspective of three short years later, and the scandals of WorldCom and Enron, you could suggest that a hasty deregulation might have costs of its own. And that deregulation does not necessarily mean less government monitoring of industries.