Prices: Price of a pack of Marlboro cigarettes (mid-price store, London) from Economist Intelligence Unit. “World Cost of Living Survey.” London, UK: Economist Intelligence Unit, 2017.
Illicit market: HM Revenue & Customs. “Measuring Tax Gaps 2017,” 2017.
Inflation: International Monetary Fund. “World Economic Outlook Database,” 2017. http://www.imf.org.