Key points are not available for this paper at this time.
© 2016 The Author. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). http://dx.doi.org/10.1016/j.foodpol.2016.12.001
Jennifer Clapp (2016) studied this question.