ACCC looks at supermarket treatment of suppliers, fuel shopper-dockets THE consumer watchdog has stepped up its campaign against the major supermarkets by signalling concerns over their behaviour with suppliers and the impact of shopper dockets on the petrol market. In testimony to a Senate committee last night, Australian Competition and Consumer Commission chief Rod Sims for the first time backed the formation of a legally enforceable code of conduct governing relations between the big supermarkets, and indicated his concern about the impact of shopper dockets on the petrol market.