In the first couple of sections, Sexual & Medical, he presents some good arguments in favor of less government interference & that's not surprising, given his Libertarian stance that he warns about in the introduction. His arguments are somewhat thin, but not too bad.
I found that the third section on free speech lost some cohesiveness of argument. His arguments for not regulating blackmail, slander & libel were very thin. His comparisons against 'academic freedom' aren't particularly valid. He presupposes rationality & responsibility on the part of businesses that I don't believe exist, especially in his case for free speech against the yelling of, "Fire!" in a movie theater. This is an unfortunate habit of Libertarians.
He puts up a fair defense for advertising & overall brings up some good points, but they lack the conviction & depth of his earlier arguments supporting sex & drugs. His arguments for unregulated cab drivers are OK, immediately followed by poor arguments supporting ticket scalping. Over & over he does this. He makes valid points & then weak ones usually due to faulty premises, not the logic inherent to his argument until he gets to 'The Dishonest Cop' & here his logic & premises fall apart.
He takes his theories over the top into absurdity in his discussions about counterfeiting money, saying that only gold & silver are real money, again showing his premises are incorrect. He forgets (or ignores) that currency is a consensus of worth. Precious metals, jewels & even seashells were historically used because they were not counterfeitable, fairly rare & ornamental. They had no use in industry, yet everyone wanted them & agreed on their worth. The current global consensus is not to base money on any specific goods since there isn't enough of anything that would make sense & their value would affect significant industries. He shows that he understands debasement, inflation & other ills that can befall a currency, yet makes specious arguments for allowing counterfeiting on the grounds that the government already does it. Silly.
The book gets worse, if possible, after this in sections V, VI & VII, Finaces, Business & Ecology, respectively. Several categories don't need any defense; inheritors & speculators. Others, profiteers, stripminers & litterers, are improperly defined, poorly defended & a waste of time to read. He goes out of his way to make completely improper comparisons in his rant against the establishment & its departure from his Libertarian values.
He gets somewhat back on track with section VIII, Labor, & his discussion on the minimum wage law, but fails to take into account the growth of technology, which undermines one of his major arguments. That's the pattern - make a somewhat convincing argument & then blow it through neglect or diatribe.
He follows this near success with the most specious & horrible arguments for child labor. I guess he doesn't read much history, as he actually writes, "Moreover, the institution of child labor is an honorable one, with a long and glorious history of good works." Abortion wasn't legal when this book was written, so one of his main arguments against parental responsibility is void.
Basically, the book was a waste of time. If it teaches anything, it's to watch what you spend time reading.