In response to Sen's analysis, The Beer Store commissioned a survey of Quebec – Ontario beer pricing by Debra Aron, an economist with Navigant Economics, which reviewed average TBS home consumer beer prices for all of 2013 in comparison to all beer sales at Quebec seven largest grocery chains, utilizing Neilsen data, for the same period. Aron's study concluded that the average TBS beer prices, excluding all taxes, were 18% less than those at Quebec grocery stores in 2013 or on a per case basis approximately $4.40 less per case of 24 cans.