Sunday Monitor: Jeffrey Sachs has a new book out. The renowned author and economist, in a follow-up to his 2005 best seller, “The End of Poverty,” continues his assessment of the global economy and what it will take to meet the challenges of the 21st century. In the book titled, “Common Wealth: Economics for a Crowded Planet,” Sachs argues that unless the world comes together to face the four major challenges of global poverty, stabilising the global population, narrowing the gaps between the rich …