It is on the edge of Fall 2012, and I realized today that it is about twenty years since the publication of my first scholarly article, Estoppel: A New Justification for Individual Rights. It was published in Reason Papers No. 17 (Fall 1992), a journal established and then edited by my friend Tibor Machan. In How I Became A Libertarian, I explain how it came about:
By 1988 I was in law school, and becoming a more well rounded libertarian, having read by this time Rothbard, Mises, Bastiat, the Tannehills, and a non-trivial portion of the books offered in the Laissez-Faire Books catalog. In that year there were two significant events in my life, from a libertarian perspective. One was Hans-Hermann Hoppe’s controversial and provocative article in Liberty, “The Ultimate Justification of the Private Property Ethic” (related articles linked here). In this article Hoppe sets forth his “argumentation ethics,” which holds that the libertarian private property ethic is implied in the very activity of argumentation—because those engaged in argumentation already presuppose the value of conflict-avoidance and the ability to control property and thus, those arguing in favor of socialism contradict themselves.
The second thing was that I encountered the legal principle of “estoppel” in my contracts class. This is the ubiquitous legal principle that precludes someone from asserting a legal claim or position that is inconsistent with earlier statements or behavior. I remember sitting in contracts class, as Professor Morris lectured on this topic, thinking “Eureka!” to myself, as I began to see that the concept of estoppel meshed perfectly with libertarian logic (and also with Hoppe’s argumentation ethics). The libertarian non-aggression principle holds that force may only be used in response to (initiated) force. There is a nice symmetry here. One may use force, if and only if it is response to initiated force (aggression). …
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