On the issue of supplier dealings, Mr Sims advised that the ACCC expects to form an opinion by the end of the year on whether major supermarket chains have engaged in unconscionable conduct in their dealing with suppliers and whether they have misused their market power by discriminating in favour of their own house brand products. On the issue of shopper dockets, Mr Sims advised that the investigation into the trend to larger and longer fuel shopper docket offers is nearing completion. As stated by the chairman, the current investigation is focused on whether Coles and/or Woolies "may be distorting price competition between fuel retailers by offering discounts on fuel purchased from their retail fuel sites in circumstances where, due to retail fuel margins, the discount may be difficult or impossible for equally efficient competing retailers to match, due to the nature of Coles' and Woolworths' activities in other (unrelated) markets."