The United Nations says it can end poverty, stop global warming, and end the threat of contagious disease while also unlocking $7 trillion of hidden wealth from developing nations in the process. If this sounds too good to be true, that’s because it is. In a new book launched with great fanfare at last month’s World Economic Forum in Davos, Switzerland, The New Public Finance: Responding to Global Challenges, the United Nations Development Programme (UNDP) claims to offer “innovative financial mechanisms that could dramatically reduce the cost of managing global risks can now be implemented by governments across the world.”...