Timothy Irwin and Tanya Mokdad*
30 June 2009
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* Timothy Irwin is in the Wellington office of LECG (tirwin@lecg.com). Tanya Mokdad is the Canberra office. This report has been prepared for the World Bank with funding from the Public-Private Infrastructure Advisory Facility (PPIAF). It has benefited from comments from Glenn Boyle, William Dachs, David Duarte, Ben Gericke, Baher El Hifnawi, Eduardo Ley, Jorge Montecinos, Paul Reddel, and Clemencia Torres. They are not responsible for errors that remain.