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. 2010 Jun;10(3):259–263. doi: 10.7861/clinmedicine.10-3-259

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Fig 3. — Effect of income inflation on the levels of duty on various alcoholic beverages since 1980. Trends in the duty on various alcoholic beverages were adjusted for changes in real disposable income – using a methodology developed by the NHS Information Centre (Statistics on Alcohol 2008) to calculate an Alcohol Affordability Index. The Beverage Duty Affordability Index is normalised to 100% in 1980 and was calculated as follows (using spirits as an example): Spirits Duty Index (SDI) = spirits duty normalised in 1980; Relative Spirits Duty Index (RSDI) = SDI/Retail Price Index (RPI) ×100; Spirits Duty Affordibility Index (SDAI) = Real Disposable Income (RDI)/RSDI × 100. Beverage duty data from Ref 6. RPI and RDI from Statistics on Alcohol 2008.