At the other extreme, the consumption tax rate should be very, very high for any products that impose massive negative externalities. Consider handgun ammunition. Currently, one can buy five hundred rounds of 9 mm ammunition for about $110 from online U.S. retailers--about twenty-two cents each. But each round of ammunition has a slight chance of falling into the wrong hands and killing someone. How slight? About 10 billion rounds are sold per year in the United States. There are about thirty thousand gun-related deaths in the United States per year (including suicides, homicides, and accidents). Assuming the typical gun death involves one round of ammo, the chance that any given round will end up killing someone is about thirty thousand divided by 10 billion, or three per million. Now, a person's life is generally reckoned to be worth about $3 million, according to the usual cost-benefit-risk analyses by highway engineers, airlines, and hospitals. If each bullet has a three per million chance of negating a $3 million life, then that bullet imposes an expected average cost on society of $9. That's about forty times its conventional retail cost of $0.22, so, by my reasoning, it should be subject to a consumption tax rate of 4,000 percent. This is obviously a rough calculation; it ignores the injury costs of nonlethal shootings (which would increase the tax) and the crime-deterrence effects, if any, of citizens having ammo (which would decrease the tax).