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The United Kingdom has a drinking problem. British per-capita consumption of alcohol rose 19% between 1980 and 2007, compared with a 13% decline in other developed countries. Worried about excessive drinking among young people, the British government increased the tax on beer by 42% from 2008 to 2012. Under what conditions will this specific tax substantially reduce the equilibrium quantity of alcohol? Answer in terms of the elasticity of the demand and supply curves.