In a few weeks, I’ll give my standard lecture on Prohibition in the US and its similarity to the War on Drugs. It’s one of the more insightful applications of supply and demand analysis, and I think it’s effective in making students appreciate the power of the economic way of thinking. In fact, when Dave gave his Prohibition-War on Drugs lecture in EC 101 back in 1997, I became hooked on Econ and never looked back.
For teachers and professors who give this lecture, the standard approach is to draw an inelastic demand curve for alcohol. You then discuss the shock to supply that came about during Prohibition, the windfall profits and subsequent black market, and the unintended consequences of well-intentioned policy. You can then talk about the end of Prohibition and a return to relative calm in the alcohol market. After pulling students in with the Prohibition example, the War on Drugs is a pretty easy extension.
The key to the story is the inelastic demand curve. I often say that since smoking cabbage, cigarettes, or crack aren’t very good substitutes for marijuana, quantity demanded will only fall slightly as prices rise. At this point, one of my students almost always incriminates himself by saying, “But, Dr. B, you substitute between different marijuana types as the price rises…” While the student is correct, this is usually an opportunity for a joke, “Well, Joe, I guess I don’t know as much about dope as you do…But, you’re right that people will substitute, and they’ll tend to go for more potent forms of the substance.” In terms of specific substitution, though, my lack of familiarity with the marijuana market usually forces me to punt.
Thanks to this CNBC slide show, the excellent Showtime program Weeds, and my viewing of Pineapple Express (a terrible movie) last night, though, I may actually be able to hold my own with Joe this time around!