Food purchases of New Zealand adults under different conditions in the Virtual Supermarket (pilot)

INTERVENTION: All participants will be asked to conduct a typical weekly shop in the Virtual Supermarket, which is a three‐dimensional software application that has been designed in the image of a real New Zealand supermarket. Upon registration, participants will be blindly randomised to one of the following: ‐ control ‐ a 20% tax on sugar sweetened beverages and no information about the tax ‐ a 20% tax on sugar sweetened beverages and information in the form of a newspaper article about the tax prior to the virtual shop ‐ a 20% tax on sugar‐sweetened beverages and information in the form of in‐store labels on taxed products ‐ a 20% tax on sugar‐sweetened beverages and information in the form of both in‐store labels on taxed products and a newspaper article about the tax prior to the virtual shop ‐ no tax on sugar sweetened beverages and information in the form of a newspaper article about the tax prior to the virtual shop ‐ no tax on sugar‐sweetened beverages and information in the form of in‐store labels on "taxed" products Participants randomised to an information condition but no tax will be falsely informed that a tax has been put in place (e.g. taxed label on SSB but no price change) CONDITION: Obesity PRIMARY OUTCOME: Differences in sugar‐sweetened beverage purchases (in litres) between groups in the virtual shop (participants do not actually purchase the products) SECONDARY OUTCOME: Differences in purchases of other product categories in the Virtual Supermarket in the virtual shop ; ; *Beverages (Alcoholic beverages, 100% fruit juices, Milk, Other non‐SSBs) ; *Baby care ; *Bread, bakery, cereal, and cereal products ; *Convenience foods, deli and chilled foods ; *Dairy and eggs (not milk) ; *Edible oils and oil emulsions ; *Fruit and vegetables ; *Meat, fish and seafood ; *Snack foods Self‐reported response to sugar‐sweetened beverage tax and information ; ; The questionnaire used was designed specifically for this study but incorporates questions from previous studies on the determinants of purchasing decisions. INCLUSION CRITERIA: Adult (over 18 years) Key responsible person in the household for grocery shopping Speaks and reads English Has access to a computer and internet Has an email address