"By the 1960s Hayek was seeing complex orders everywhere. The orders were created as the result of individual elements following simple rules, and the principles at work could be effectively described using an evolutionary (though not Darwinian) metaphor. In the late 1960s Hayek explicitly added the mechanism of group selection to his description of cultural evolution. In the 1970s Hayek published the three volumes of Law Legislation and Liberty, and rules, orders and cultural evolution were all prominently on display. This was equally true of his last book, The Fatal Conceit, though there were also some new ideas to be found there. That Hayek’s health began deteriorating as this book was put together raises some intriguing interpretive issues."