World Ills Are Obvious, the Cures Much Less So
Fourth and final article in series, Global Contagion: A Narrative, on global financial crisis; crisis that began 19 months ago in Thailand is knocking on gates of American heartland and could be landmark crisis of post-cold-war era; while simplest challenge is for US to sustain strong growth rates, broader task will be to prevent nationalistic catacylsms in worst-off countries, like Russia and Indonesia, and to contain political and security risks of explosive frustration if crisis bites further into places like China and Latin America; while economy has demonstrated tremendous flexibility and resilience, uncertainties arise because US stock market is 64 percent higher than in December 1996 when Alan Greenspan, Federal Reserve chairman, warned against irrational exuberance; photos; chart (L)