The first of the Sen studies was commissioned by the Ontario Convenience Store Association and surveyed six 24-pack domestic brands from IGA and Metro Quebec flyers compared to the same brands at The Beer Store in Ontario over a 22-week period in 2013. Sen corrected tax analysis associated with the original study and added three import brands from a Costco in Quebec in subsequent analysis. Correcting for tax differentials between the two provinces, positive price differences of $1.3 - $3.3 were found to exist between their average price of 24-bottle packs of brands including Molson Canadian, Molson Dry, Coors Light, Budweiser and Bud Light. Using Molson Canadian as an example, the adjusted 24 pack price from Quebec IGA and Metro flyers was found to be $26.81 versus $28.12 for Ontario TBS locations.