Collusion in public procurement (so-called bid rigging) is specific form of a cartel when the tender participants agree in advance on mutual non-competing, thus the purpose and aim of public procurement is frustrated.
The Office prepared several documents in which it explains why bid rigging is harmful, what the indications of collusion are and it recommends how to prepare a tender to minimise the risk of collusion.
Kartelové dohody vo verejnom obstarávaní (in Slovak)
Indications of anticompetitive conduct of entrepreneurs within public procurement
Guidelines for Fighting Bid Rigging in Public Procurement (OECD document)