Lloyd, T. A.; Morgan, C. W.; McCorriston, S.; Zgovu, E. - 2011
are a key feature of aggregate price variation with around 40 per cent of price variation being accounted for by sales … once price differences for each UPC level across the major retailers are accounted for; (ii) much of the price variation … small proportion of price variation that is observed in UK food retailing is common across the major retailers suggesting …