Just as programmers have a model of computation, libertarians have what I call a model of interaction. Just as a programmer can “playcomputer” by simulating how specific lines of code will change program state, a libertarian can “play society” by simulating how specific actions will change societal state. The libertarian model of interaction cuts across economic, political, cultural, and social issues. For just about any given law, for example, a libertarian can tell you exactly how such a law will affect society (minimum wage laws create unemployment by setting a lower-bound on entry-level wages, drug prohibition artificially inflates drug prices which leads to violent turf wars, etc.). As another example, for any given social goal, a libertarian will be able to tell you the problems generated by having government try to achieve that goal and will tell you how such a goal can be achieved in a libertarian society.I believe this is qualitatively different from other predictive models because of the breadth of the model and the focus on transitions (both of which are also true of programming). On newsgroups I often see questions … [that] … libertarians almost always quickly answer by saying, “I’ll tell you exactly what would happen…” And, surprisingly, the libertarians tend to give the same answer in most cases.