Many of the public concerns related to PPPs are mainly related to the loss of public control over the facility, and whether the contract clauses adequately protect the public interest. PPP agreements include hundreds of pages of contract terms and standards that should be met by the concessionaire, and are developed to best address risk and the interests of both parties entering into the agreement. And, as the public sector builds experience in PPPs, many of the issues experienced in early PPP agreements become "legacies of the past" (Buxbaum and Ortiz 2007), which are reflected in the use of more "limited-compete" instead of "non-compete" clauses (see the section on Non-Compete and Other Unanticipated Event Provisions later in this chapter), or revenue sharing as opposed to a one-time up-front payment. Furthermore, PPP agreements include performance requirements and/or specifications that must be met by the concessionaire.