Last month the San Francisco city council introduced a proposal to tax soda at a rate of two cents per ounce. The tax, which would have to be approved by voters, would add a whopping $1.44 to the cost of a six-pack of soda. The council liked the idea so much that they soon introduced a competing proposal to tax soda at exactly the same rate. But, as Baylen Linnekin points out, Research also shows soda taxes don't work. For example, a 2010 study published in the Archives of Internal Medicine suggested that even an enormous soda tax of 40 percent would not make people healthier. Maybe that's why lawmakers and voters elsewhere have defeated and repealed such soda-targeting schemes.