Document de travail The impact of increasing competition for non-contract parcels on postal prices and efficiency decisions Philippe De Donder, Frank Rodriguez et Soterios Soteri n° 886, mai 2018 RéférencePhilippe De Donder, Frank Rodriguez et Soterios Soteri, « The impact of increasing competition for non-contract parcels on postal prices and efficiency decisions », IDEI Working Paper, n° 886, mai 2018.