• The concentration and bundling of activities and contractual powers in the hands of a small number of partners not only undermines the self-regulatory effect of the competitions between potentials providers of services, but may also "lock-in" the PA in relationship that in, addition, may not be allowed to fail.29
• Risk allocation may serve to cover rents or generate cost overruns due to the PA lack of capacity.
• Output specification not clearly defined may favor conflicts or nullify the effects of a payment system based on incentives and penalties.
• The same introduction of flexibility into the contract may lead to opportunistic practice and favor corruption.
• The question of accountability and governance becomes even more relevant when the partnership is reluctant to divulge information to outsiders on the ground of commercial confidentiality or data protections.
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29 SHAOOUL J. (2003), "A financial Analysis of th National Air Traffic Services PPP", Public Money and Management, 23: 3, pp.192