The Productivity Commission will soon conduct an Inquiry "to look at ways to bring down the cost of infrastructure, including facilitating greater private sector involvement in major infrastructure projects," the treasurer, Joe Hockey, foreshadowed in a speech to the Centre for Independent Studies on Friday."This Inquiry will be about how this Government can build a constructive partnership with the private sector," he said."More announcements on infrastructure, including a new partnership with our state colleagues, will be announced over the coming months. "Let me assure you that innovative funding models, a credible pipeline of work and a rigorous cost/benefit process will underpin our growth plan."