Dr. Philip Williams, chairman of Frontier Economics, was invited to participate in the sixth Australian Competition and Consumer Commission regulatory conference held on Thursday 28 and Friday 29 July 2005 on the Gold Coast, Queensland, Australia. The theme of this year's conference was the relationship between essential facilities and downstream markets. Philip presented two papers: "Infrastructure and Export Markets : the underlying logic" and "Access to wastewater transportation: optimal regulation in the event of declaration".