This paper sets out essential facts about the economic case for water-related investment and the financing gap. It charts a series of actions to better value water and ultimately facilitate investment at a scale commensurate with the commitments of the global community.

Uncertainty is inherent to forecasting and assessing the uncertainty surrounding a point forecast is as important as the forecast itself. Following Cornec (2010), a method to assess the uncertainty around the indicator models used at OECD to forecast GDP growth of the six largest member...