A 15 pack of Steinlager Classic was advertised with "at least 20 per cent off" - but in some of the Progessive supermarkets, it had been more than six months since it had been sold at the standard shelf price of $31.68.
"When a retailer uses misleading techniques to lure customers in, or to make a sale, they not only dupe the customers, but also harm their competitors who are acting honestly," said Commerce Commission General Manager of Competition Kate Morrison.
"We believe that this practice breaches the Fair Trading Act. The Comission considers it misleading to use a standard shelf price as the basis for a saving claim when that price has not been displayed or charged for lengthy periods of time."
Progressive confirmed the discounts were from their "standard shelf price".
Progressive Enterprises general manager of marketing Bridget Lamont said the company did not set out to mislead customers.
"Progressive Enterprises has worked closely with the Commerce Commission over the last year to ensure all advertising and promotions of beer sales in its stores comply with the Fair Trading Act."
She said Progessive had cooperated with the commission's investigation, and changed their advertising and promotional material when made aware its concerns. They would continue to cooperate.
The commission said a warning was enough in this case and would not take further action because the practice is reasonably widespread.