Consumption of soda and other sugary drinks fell by more tha…

Consumption of soda and other sugary drinks fell by more than a fifth in low-income neighborhoods of Berkeley after the California city became the first in the U.S. to introduce the penny-per-ounce tax last year. What is the elasticity of soda among low-income neighborhoods of Berkeley? (to simplify your calculation, assume a can of soda is 10 oz., and the price before the soda tax is $1) Using the midpoint formula.