The Spanish retail chain Dia Group and the French supermarket Intermarche have agreed to create CINDIA, a joint platform for negotiating limited to Portugal. Intermarche has been active in Portugal since 1991, while Grupo Dia has been present in the country since 1993, operating stores under the Minipreco banner. Announcing the news in a statement, Dia said that CINDIA would be exclusively responsible for negotiating with the biggest leading national …