Joint bidding is the practice of two or more independent suppliers submitting a single bid, a widespread practice in private and public procurement. This practice may generate efficiencies through synergies and information sharing, but may also be abused to reduce the number of competitors...

The EU's single market in government purchases constitutes a fundamental pillar of economic integration throughout the continent, as it amounts to 4% of GDP. If competition is deficient efficiency losses ensue. As we know surprisingly little about the effectiveness of monitoring and enforcement...