Hunting Down Social Darwinism is the third and final installment in the trilogy, The Nature of Liberty. The trilogy gives a secular, ethical defense of laissez-faire capitalism, inspired by Ayn Rand's ideas. The trilogy's first book, The Freedom of Peaceful Action, provided the philosophic theory behind the ethics of a free-enterprise system based on the individual rights to life, liberty, and private property which John Locke described. The second installment, Life in the Market Ecosystem, explained how free enterprise functions much as a natural ecosystem wherein behavioral norms develop, bottom-up, from repeat interactions among individual participants in the economy. As such defenses of free enterprise are frequently criticized as "social Darwinism," however, this third and final installment of the trilogy asks the question, "What is social Darwinism?" The book embarks on a hunt for the term's meaning, explores social Darwinism's beginnings, and examines whether it is fair to describe such nineteenth-century free-market advocates as Herbert Spencer and William Graham Sumner as social Darwinists. It then addresses the accusation that the free-market Darwinism commonly ascribed to Spencer and Sumner rationalized bigotry and founded the pseudoscience of eugenics. In the process, the book refutes various myths about the topic popularized by such scholars as Richard Hofstadter and John Kenneth Galbraith. The extent to which the popular narratives about social Darwinism prove to be inaccurate holds enormous ramifications for current controversies. It has implications for debates over the ethical appropriateness of reducing taxpayer spending on social welfare programs, and also sheds new light on the pros and cons of attempts to apply biological evolutionary theory to the study of human social institutions. Additionally discussed is the manner in which various prominent figures in economics, evolutionary psychology, and Complexity Theory have grown famous for advancing ideas which Spencer and Sumner originated, even as such figures simultaneously downplay the importance of Spencer and Sumner to their field. Following the hunt for social Darwinism, this work sums up the trilogy with some final thoughts on the importance that liberty holds for every effort to live life to the fullest.

The Freedom of Peaceful Action is the first installment of the trilogy The Nature of Liberty, which makes an ethical philosophic case for individual liberty and the free market against calls for greater government regulation and control. The trilogy makes a purely secular and nonreligious ethical case for the individual's rights to life, liberty, private property, and the pursuit of happiness as championed by the U.S. Founding Fathers. Inspired by such philosophic defenders of free enterprise as John Locke, Herbert Spencer, and Ayn Rand, The Nature of Liberty shows that such individual rights are not imaginary or simply assertions, but are institutions of great practical value, making prosperity and happiness possible to the degree that society recognizes them. The trilogy demonstrates the beneficence of the individual-rights approach by citing important findings in the emerging science of evolutionary psychology. Although the conclusions of evolutionary psychology have been long considered to be at odds with the philosophies of individual liberty and free markets, The Nature of Liberty presents a reconciliation that reveals their ultimate compatibility, as various important findings of evolutionary psychology, being logically applied, confirm much of what philosophic defenders of liberty have been saying for centuries. Moreover, proceeding from the viewpoint of Rand, this work argues that the structure of society most conducive to practical human well-being is commensurately the most moral and humane approach as well. The trilogy's first installment, The Freedom of Peaceful Action, focuses on the secular, philosophic foundation for a society based on individual rights. Starting from a defense of the efficacy of observational reason against criticisms from Immanuel Kant and Karl Popper, it demonstrates how a philosophic position of individual liberty and free markets is the logical result of the consistent application of human reason to observing human nature. This installment demonstrates that any political system that wishes for its citizens to thrive must take human nature into account, and that an accounting of human nature reveals that a system of maximum liberty and property protection is the one must conducive to peace and human well-being.