The effect of food price changes on consumer purchases: a randomised experiment

The Lancet. Public Health
Wilma E WaterlanderTony Blakely

Abstract

Most evidence on health-related food taxes and subsidies relies on observational data and effects on single nutrients or foods instead of total diet. The aim of this study was to measure the effect of randomly assigned food price variations on consumer purchasing, where sets of prices emulated commonly discussed food tax and subsidy policies, including a subsidy on fruit and vegetables, a sweetened beverage tax, and taxes on foods according to sugar, sodium, and saturated fat content. In this study, adult participants (≥18 years) in New Zealand completed up to five weekly shops in a virtual supermarket. Each shopping occasion was randomly allocated to control (no change in prices) or one or more pricing options simulating the following: a fruit and vegetable subsidy (20%), a sweetened beverage tax (20% or 40%), a saturated fat tax (NZ$2 per 100 g or $4 per 100 g saturated fat), a salt tax ($0·02 per 100 mg or $0·04 per 100 mg sodium), or sugar tax ($0·40 per 100 g or $0·80 per 100 g sugar). The primary outcome was the healthiness of the total shopping basket for each weekly shop (% of total unit food items defined as healthy). Low and high price change options were combined in analyses (eg, results for a saturated fat tax are a...Continue Reading

Citations

Sep 6, 2019·BMJ : British Medical Journal·J Bernadette Moore, Barbara A Fielding
Feb 10, 2021·JMIR Formative Research·Jody C HoeninkJoline W J Beulens
May 1, 2021·Current Nutrition Reports·Gary SacksKathryn Backholer
May 1, 2021·International Journal of Environmental Research and Public Health·Pasquale E RummoLindsey Taillie
Apr 26, 2020·Food Research International·Mariana Piton HakimDiogo Thimoteo da Cunha

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