In laying out an argument for drug legalization in his Washington Post column Tuesday, George Will notes that the price of cocaine has dropped between 80 and 90 percent over the last three decades. Why has coke gotten so cheap?

Economies of scale. Cocaine prices are indeed much lower than they were in the early 1980s, but that’s mostly because of a precipitous change in the drug market during the Reagan era. Until then, cocaine was a small-time business, with coca leaves’ being processed in the basements of rickety houses in Colombian suburbs. Trafficking was a usually one- or two-man operation. In their early days, even legendary drug kingpins like Pablo Escobar and the Ochoa brothers had to smuggle their cocaine out of the country in their own suitcases. With the surge in demand that began at the end of the 1970s, however, the kingpins built out their empires, modernizing processing, transport, and retail networks, and managed to lower prices by more than 60 percent over the next 10 years.

It took traffickers a little while to ramp up production at first. Within two or three years, many owned small planes that could transport a metric ton of cocaine in a single shipment. (You can’t fit much more than 50 kilograms of cocaine in a suitcase.) By the end of the 1980s, cocaine was traveling on submarines and cargo ships, too. Kingpins owned sprawling processing complexes that employed hundreds of workers and could churn out several tons of cocaine per week. They concocted clever risk-spreading mechanisms. Multiple producers broke their shipment into segments and pooled them together, so that a single interdiction couldn’t deliver a devastating economic blow to any one of them. Escobar offered insurance to smaller traffickers: For a 10 percent fee, he would replace any seized drug shipments. All of these moves drove down the cost of delivering drugs to the market, and the drug lords passed those savings on to the consumer......