Berkeley, California was the first US city to pass a penny-per-ounce sugar-sweetened beverage tax in January 2015. A study published in April 2017 found that in the year following the tax’s implementation, sales of sugar sweetened beverages declined significantly (by 9.6%) as did self-reported consumption. Sales of untaxed beverages (such as water) increased by 3.5%. This is preliminary evidence that the penny-per-ounce tax is an effective way to encourage consumers to choose healthier beverages. Read more here.