By Angus DeatonPRINCETON — Rather suddenly, capitalism is visibly sick. The virus of socialism has re-emerged and is infecting the young once more. Wiser heads, who respect capitalism’s past achievements, want to save it, and have been proposing diagnoses and remedies.

By Mohamed A. El ErianNEW YORK — The economics profession took a beating after most of its leading practitioners failed to predict the 2008 global financial crisis, and it has been struggling to recover ever since.

By J. Bradford DeLongBERKELEY — The next global downturn may still be a little way off. The chances that the north Atlantic as a whole will be in recession a year from now have fallen to about one in four.

By Jayati GhoshNEW DELHI — Confounding the grim prediction made by the British economist Thomas Malthus in 1798, the world currently produces more than enough food for a population that has increased almost tenfold since then. Today’s food problem is not absolute scarcity.

 By Minxin PeiLONDON — It is convenient to call the escalating geopolitical contest between the United States and China a “new cold war”.

By Tedros Adhanom Ghebreyesus and Senait FissehaGENEVA — Since the start of the year, we have travelled from Afghanistan and Pakistan, where health workers administering the polio vaccine are battling snowstorms to reach children who need it, to North Kivu, where officials are tr

By Nicholas AgarWELLINGTON — Nowadays, one struggles to think of any jobs that will still be available for our children when they grow up.

By Carmen M. Reinhart and Christoph TrebeschCAMBRIDGE — The challenges posed by an ageing population are manifold, and they are neither new nor unique.

By Anders Fremstad and Mark PaulFORT COLLINS/SARASOTA — Three years ago, the United States achieved a grim milestone: its first climate refugees.