Responses to an essay by Andrew Witty, the C.E.O. of UnitedHealth Group. Also: Threats to democracy, in Hungary and America; a check on Trump; avoiding taxes.

Foreign leaders have rushed to ingratiate themselves with Donald J. Trump in recent days, nervously recalling the clashes, insults and feuds of his first presidency.

Japan has been trying to boost its fertility rate for 30 years. Now the rest of the rich world is, too.