The Swiss Competition Commission, WEKO, has approved the acquisition by Swiss retailer Coop of rival retail chain Waro. Coop is buying the 28 Waro stores from local discount retailer Denner, a unit of Rast Holding, for an undisclosed sum. Weko's preliminary investigations has suggested that the acquisition might lead to Coop having too dominant a position in the fresh food retail market, reported the Swiss News Digest.